US Civil War: causes, course and effects (1840–1877)

Building the United States political system

Political systems and caudillo rule in Latin America

Causes and impact of the War of 1812

The Mexican–American War, 1846–1848

Rebellion and Confederation in Canada

### The Articles of Confederation

The **Articles of Confederation**, drafted in 1777 and fully ratified in 1781, created a loose union of thirteen states. Having just experienced British rule, the revolutionaries distrusted centralized authority. The Articles therefore treated the states as largely sovereign.

Congress could conduct diplomacy, declare war, borrow money and manage western territories. The Northwest Ordinance of 1787 set out how territories could become states and prohibited slavery in the Northwest Territory.

Even so, the central government lacked the powers required to function effectively. It could not levy taxes directly, regulate interstate or foreign commerce, or force states to follow its decisions. There was no independent executive or national judiciary. Each state had one vote in Congress, regardless of population. Important measures needed nine states to approve them, while amendments required unanimity.

The financial weakness of the Confederation became especially serious after the War of Independence. Congress relied on voluntary contributions from the states while dealing with war debts and demands for soldiers’ pay. States imposed competing tariffs and issued different currencies. In Massachusetts, Shays’ Rebellion of 1786–1787 became an armed protest over debt and taxation. It persuaded many property-owning leaders that the Confederation could not maintain order.

Some historians see the Constitution mainly as a practical response to diplomatic, commercial and financial disorder. Others stress that political and economic elites wanted to protect property and limit popular state legislatures. Both explanations can apply: the Confederation’s institutional weakness made elite fears about instability more intense.

### The Constitution of 1787

The Philadelphia Convention met from May to September 1787. The delegates had formally gathered to revise the Articles, but instead they produced a new Constitution. It took effect in 1789 after the required nine states ratified it.

Its philosophical foundations joined Enlightenment ideas with colonial political experience:

- **Popular sovereignty:** legitimate government derived its authority from the people.
- **Republicanism:** citizens elected representatives rather than accepting hereditary rule.
- **Federalism:** authority was divided between the national government and the states.
- **Separation of powers:** legislative, executive and judicial functions were assigned to different branches.
- **Checks and balances:** each branch received powers that could limit the others, reducing the danger of concentrated authority.

The Constitution established a bicameral Congress with the power to tax, borrow, regulate commerce and provide for defence. A separately elected president led the executive and served as commander-in-chief. A federal judiciary, headed by a Supreme Court, dealt with constitutional and federal questions. The national government could act directly on individuals instead of merely asking states for assistance.

The Constitution was deliberately difficult to amend. This encouraged continuity, but it also put some decisions beyond ordinary electoral majorities.

### Major compromises

The **Great Compromise**, or Connecticut Compromise, settled the dispute between populous and less populous states. Representation in the House of Representatives depended on population, while every state received two senators.

Compromises over slavery allowed slaveholding and non-slaveholding states to remain in the same union. The Three-Fifths Compromise counted three-fifths of the enslaved population when calculating representation and direct taxation. This increased southern representation without giving enslaved people political rights. Congress could not prohibit the international slave trade before 1808, and the Constitution required the return of fugitives held to labour.

The Electoral College chose the president through state-appointed electors rather than a national direct popular vote. It also reflected distrust of unrestricted democracy. Slave states gained additional influence because electoral votes were tied to congressional representation.

Federalists argued that ratification was necessary for effective government. Anti-Federalists feared a distant central authority, a powerful presidency and the lack of an explicit statement of individual rights. Their objections helped secure the first ten amendments, ratified in 1791 as the Bill of Rights.

### Changes in the political system

The new framework strengthened national power, but political practice changed it further. Organized parties developed despite the founders’ suspicion of factions. Federalists supported a strong national government and commercial development. Democratic-Republicans defended a narrower interpretation of federal power and emphasized agrarian republicanism. The election of 1800 showed that control of the federal government could pass peacefully between rival parties.

The Twelfth Amendment, ratified in 1804, required electors to cast separate votes for president and vice-president. In *Marbury v Madison* (1803), the Supreme Court asserted **judicial review**, the authority to invalidate legislation judged contrary to the Constitution.

During the first half of the 19th century, most states removed property qualifications for white male voters. Politics consequently became more popular and party-based, although women, Indigenous peoples and most African Americans remained excluded. The federal system continued to produce conflict over tariffs, banking, internal improvements, slavery and the balance between state and national authority.

The Civil War transformed that balance. The Union victory rejected secession as a workable constitutional remedy and strengthened federal supremacy. The Thirteenth Amendment abolished slavery in 1865; the Fourteenth established national citizenship and required equal protection of the laws in 1868; and the Fifteenth prohibited denial of voting rights on grounds of race, colour or previous enslavement in 1870. Their enforcement remained contested, but they changed the Constitution from a framework that accommodated slavery into one that formally protected freedom and citizenship.

### Challenges after independence

The collapse of Spanish and Portuguese authority did not automatically create stable nation-states. Independence leaders had to build legitimate institutions across vast territories divided by regional identities, poor communications and unequal social structures.

Constitutional disputes focused on where power should be located and how it should operate. Centralists argued that strong national governments were necessary to prevent fragmentation. Federalists wanted provinces or states to retain substantial autonomy. Liberals generally supported written constitutions, legal equality and limits on corporate privileges. Conservatives placed more emphasis on order, the Catholic Church and inherited social authority. These labels differed from country to country and did not represent consistent continent-wide parties.

Other difficulties included:

- treasuries weakened by war, disrupted trade and public debt;
- armies and militia commanders accustomed to political influence;
- conflict between capital cities and provincial elites;
- limited administrative reach in rural and frontier areas;
- disputes over Church property and privileges;
- the political exclusion or marginalization of Indigenous peoples, enslaved people, free people of colour, rural workers and most women;
- constitutions that promised representative government without creating durable acceptance of electoral outcomes.

The wars of independence weakened royal institutions but did not provide an agreed replacement. Political leaders often rewrote constitutions, removed presidents by force or appealed to the army. Representative ideas still mattered: elections, legislatures and constitutional language remained important sources of legitimacy, even when governments violated them.

### Nature of caudillo rule

A **caudillo** was a personal political-military leader whose authority rested heavily on reputation, armed followers and networks of loyalty rather than on impersonal institutions alone. Caudillos could hold constitutional office, but their power usually went beyond its formal limits.

Caudillo rule commonly relied on personal patronage, military force, alliances with landowners or provincial notables, and claims to defend order or regional interests. A caudillo rewarded supporters with offices, protection or access to resources. Opponents might face censorship, exile, imprisonment or violence.

Caudillos did not all share the same ideology. Some defended federalism and provincial autonomy, while others built centralized governments. Some allied with conservative institutions; others adopted liberal reforms. The defining feature was the personal and coercive basis of authority, not a single programme.

### Conditions favouring caudillismo

Caudillismo flourished where central institutions were weak and local commanders had armed clients. Independence warfare had elevated military leaders and made political violence more normal. Poor transport and communications made provincial power difficult for national capitals to control. Landownership and patron-client relations also allowed prominent individuals to mobilize rural supporters.

Regional economic differences played a part as well. Provinces competed over ports, customs revenue and access to overseas trade. Political conflict often combined ideological disagreement with material struggles over who controlled taxation and commerce.

One interpretation presents caudillos as obstacles to constitutional government who prolonged instability through violence and personalism. Another argues that they filled a vacuum. Where states could not enforce decisions, caudillos negotiated among provinces, mobilized armies and imposed a measure of order. Their rule could therefore help build states while weakening the rule of law at the same time.

### Argentina under Juan Manuel de Rosas

Argentina provides a strong case study of caudillo government. After independence, Buenos Aires and the interior provinces disagreed over political authority and customs revenue. Unitarians favoured centralized government, whereas Federalists defended provincial autonomy. The failure of national constitutions and repeated civil warfare allowed provincial leaders to dominate politics.

Juan Manuel de Rosas, a wealthy landowner with strong connections to rural workers and militia, governed Buenos Aires from 1829 to 1832 and again from 1835 to 1852. During his second term, the provincial legislature granted him extensive powers. Rosas called himself a Federalist and preserved the formal sovereignty of the provinces. However, his control of Buenos Aires customs revenue and foreign relations gave him influence throughout the Argentine Confederation.

Rosas presented himself as the defender of social order, religion and federalism. His government required public demonstrations of loyalty and used censorship, surveillance and political symbolism. The Mazorca, associated with the pro-Rosas Popular Restoration Society, intimidated and attacked opponents. Unitarians and other critics went into exile.

Rosas defended the economic dominance of Buenos Aires and its port. The Customs Law of 1835 raised duties on some imports and offered limited protection to provincial producers. The continuing concentration of customs income in Buenos Aires, however, caused resentment. Rosas resisted French and Anglo-French intervention and survived blockades, which strengthened his nationalist standing among supporters.

His rule brought greater continuity to Buenos Aires and preserved a loose confederation during a period of regional conflict. It also concentrated power, restricted political opposition and left Argentina’s constitutional organization unresolved. Justo José de Urquiza, governor of Entre Ríos, rebelled against Rosas and defeated him at the battle of Caseros in 1852. Rosas went into exile.

Rosas’s fall opened the way towards the Constitution of 1853, although Buenos Aires initially remained outside the new arrangement. His legacy remains contested: critics emphasize dictatorship and terror, while other interpretations stress his contribution to territorial cohesion and resistance to foreign pressure.

### Causes of war

The United States declared war on Britain on 18 June 1812. Maritime disputes, frontier tensions and American domestic politics all contributed to the conflict; no single cause explains it.

During the Napoleonic Wars, Britain restricted neutral trade through its Orders in Council. The Royal Navy stopped American vessels and practised impressment, taking sailors it claimed were British deserters. In 1807, the *Chesapeake–Leopard* incident became a powerful symbol of violated national sovereignty: a British warship had fired on an American naval vessel.

American leaders also accused Britain of supplying Indigenous peoples who resisted settlement in the Northwest. Tecumseh and Tenskwatawa tried to create an Indigenous confederacy opposed to American expansion. Their links with British Canada strengthened the American belief that Britain was encouraging frontier warfare. Indigenous nations, however, pursued their own objective of preserving land and autonomy.

The War Hawks elected to Congress in 1810, including Henry Clay and John C. Calhoun, argued that national honour demanded resistance. Some Americans thought conquering Canada would be easy and would remove British influence from the frontier. Expansionist ambitions therefore added to the maritime causes without replacing them.

The causes divided American opinion. Southern and western Democratic-Republicans generally supported war, whereas many New England Federalists opposed a conflict that disrupted commerce. Historians also disagree about the main emphasis. Maritime interpretations put neutral rights and impressment first; expansionist interpretations give greater weight to Canada and Indigenous lands. The declaration came from the interaction of both pressures.

### Course and settlement

American invasions of Upper Canada failed in 1812. British regulars, colonial militia and Indigenous forces captured Detroit. American forces later regained it after the battle of Lake Erie in 1813. Tecumseh was killed at the battle of the Thames that year, which seriously weakened organized Indigenous resistance in the Northwest.

In 1814, British forces occupied Washington and burned public buildings. Their attack on Baltimore failed, and American forces stopped another invasion near Plattsburgh. Andrew Jackson won at New Orleans in January 1815, after peace had been agreed but before news of the agreement reached the combatants.

The Treaty of Ghent, signed on 24 December 1814, restored the pre-war territorial position. It did not directly settle impressment or neutral maritime rights. Napoleon’s defeat and the end of the wider European war had made these issues less urgent.

### Impact on British North America

Upper and Lower Canada survived the war without being conquered by the United States. This reinforced loyalty to the British connection among many inhabitants. The conflict also encouraged a distinct British North American identity based on successful resistance. Later claims that colonial militia had won the war largely unaided understated the importance of British regulars and Indigenous allies.

Border settlements suffered deaths, displacement, disrupted trade and the destruction of farms and towns. Wartime expenditure nevertheless stimulated parts of the colonial economy and improved transport and defence.

Indigenous allies gained little from the peace. Britain did not secure the independent Indigenous territory sought in negotiations. Tecumseh’s death also reduced the possibility of a united barrier to American expansion, weakening Indigenous influence around the Great Lakes.

After the war, Britain and the United States gradually reduced tensions. The Rush–Bagot Agreement of 1817 limited naval forces on the Great Lakes. The Convention of 1818 addressed parts of the boundary and other outstanding issues. British North America still remained aware that another American attack was possible.

### Impact on the United States

The treaty brought no territorial gain, yet many Americans saw survival against Britain as a second vindication of independence. The conflict stimulated nationalism and enhanced the reputations of military figures such as Andrew Jackson.

The Federalists suffered badly because of their opposition to the war. Their Hartford Convention of 1814–1815 discussed constitutional changes intended to protect New England interests. Once news of peace and victory at New Orleans arrived, however, the convention appeared disloyal. The party then declined rapidly as a national force.

The interruption of British imports encouraged American manufacturing, particularly textiles. Inadequate finance, transport and military preparation also strengthened demands for a national bank, protective tariffs and federally supported internal improvements.

The gravest long-term consequence fell on Indigenous peoples. The defeat of Tecumseh’s confederacy and Britain’s withdrawal of effective support opened more land to American settlement. The war therefore strengthened the United States while weakening the peoples who had tried to resist its westward expansion.

### Causes

The Mexican–American War grew out of Texas’s unresolved status, a disputed international boundary and the United States’ expansionist ambitions.

Texas declared independence from Mexico in 1836, but Mexico refused to recognize it. In the United States, opinion on annexation remained divided. Texas would enter as a slaveholding state, and annexation could lead to war. Despite these concerns, the United States annexed Texas in 1845.

The two governments also claimed different borders. The United States and Texas identified the Rio Grande as the boundary, while Mexico placed the border farther north, at the Nueces River. President James K. Polk sent John Slidell to seek Mexican recognition of the Rio Grande boundary and negotiate the purchase of California and New Mexico. The Mexican government refused to receive him.

Polk favoured expansion towards the Pacific. This idea was linked to **Manifest Destiny**, the belief that the United States was entitled or destined to expand across North America. Expansion offered Pacific ports, commercial opportunities and new farmland. It also raised the difficult question of whether slavery would spread into the western territories.

In early 1846, Polk ordered General Zachary Taylor into the disputed land between the Nueces and the Rio Grande. Mexican and American troops clashed in April. Polk then told Congress that Mexico had shed American blood on American soil, and Congress declared war in May.

One interpretation presents the war as the result of Mexico’s refusal to accept the loss of Texas and negotiate a boundary. A more critical view sees Polk’s deployment as a deliberate provocation intended to secure Mexican territory. Domestic opponents, including some northern Whigs, disputed the claim that the first fighting had taken place on land that unquestionably belonged to the United States.

### Course and peace settlement

United States forces invaded northern Mexico, occupied New Mexico and took control of California with help from American settlers. Taylor defeated Mexican forces at Buena Vista in February 1847. Meanwhile, a separate army under Winfield Scott landed at Veracruz, moved inland and captured Mexico City in September 1847.

Mexico struggled with financial weakness, political division and changes of government throughout the conflict. Antonio López de Santa Anna returned to power and commanded Mexican forces, but he could not prevent defeat.

The Treaty of Guadalupe Hidalgo, signed on 2 February 1848, brought the war to an end. Mexico recognized the Rio Grande as the Texas boundary and ceded California and New Mexico to the United States. The United States paid Mexico \$15 million and accepted responsibility for certain financial claims made by American citizens against Mexico.

### Effects on Mexico

Mexico lost a vast northern territory. It included the areas that became California, Nevada and Utah, along with most of Arizona and New Mexico and parts of other later states. The defeat damaged national prestige and sharpened debate over the failures of political leadership and military organization.

The war placed Mexico under greater financial pressure and increased political instability. Mexican liberals and conservatives disagreed about how to rebuild the country. The loss of territory also became a lasting source of mistrust towards the United States.

Mexico’s defeat did not result simply from a lack of resistance. Mexican forces fought major battles, but the government had fewer financial and logistical resources. It also faced unstable political leadership and struggled to supply armies across long distances. United States naval superiority allowed Scott to carry out his amphibious invasion.

### Effects on the United States and the border region

The territorial acquisition completed continental expansion to the Pacific and gave the United States important ports and resources. Gold was discovered in California in 1848, accelerating migration and increasing the economic importance of the new lands.

Victory also intensified the sectional conflict over slavery. First proposed in 1846, the Wilmot Proviso sought to prohibit slavery in territory acquired from Mexico. It did not become law, but it revealed the growing division between North and South. The question of slavery in the new territories contributed to the Compromise of 1850 and remained a major source of conflict before the Civil War.

The war gave military experience to officers who later commanded Union and Confederate armies. It also raised Zachary Taylor’s profile, and he was elected president in 1848.

The Treaty of Guadalupe Hidalgo promised Mexican residents of the ceded territories rights and protection of property. In practice, many experienced discrimination, legal disputes and the loss of land. Indigenous peoples were incorporated into an expanding United States without their consent and faced increased settlement and military pressure. The war therefore redrew the international border while creating new conflicts over citizenship, landholding, slavery and regional power.

### Causes of the rebellions of 1837–1838

Rebellions broke out in both Lower Canada and Upper Canada, although the immediate circumstances were different. In each colony, elected assemblies had little real control because governors and appointed councils still held executive power.

In Lower Canada, the French-speaking majority wanted more say over colonial government and revenue. Louis-Joseph Papineau and the Parti patriote led the elected Assembly in opposition to appointed officials and the English-speaking commercial elite. The Ninety-Two Resolutions of 1834 called for major reforms, including greater executive accountability. Britain rejected the principal demands through the Russell Resolutions of 1837. It also authorized the colonial government to spend revenue without the Assembly’s consent.

Political grievances combined with French-Canadian concerns about language, culture and the position of the Catholic Church. Population growth, pressure on agriculture and economic hardship deepened the discontent. After meetings, arrests and clashes intensified the crisis, armed conflict began.

In Upper Canada, reformers challenged the influence of the so-called Family Compact. This network was linked to appointed office, the Church of England, and control of land and patronage. They objected to the clergy reserves, which set aside land to support Protestants, as well as to an executive that was not responsible to the elected Assembly. Economic problems and anger over land policy broadened the opposition.

William Lyon Mackenzie led the Upper Canadian rebellion in December 1837. The movement was poorly organized and was quickly defeated near Toronto. In Lower Canada, Patriote forces won at Saint-Denis but lost at Saint-Charles and Saint-Eustache. Further incursions and rebellion took place in 1838 before government forces suppressed them.

### Effects of the rebellions

The rebellions were defeated militarily. Government forces arrested participants. Some were executed, while others were transported or exiled. Papineau and Mackenzie fled, although both eventually returned.

The unrest made clear that the colonial system needed reform. In 1838, Britain sent John George Lambton, Earl of Durham, as governor general and high commissioner. At the same time, the limited participation in the uprisings showed that dissatisfaction had not become united colonial support for revolution.

Historians disagree about how to interpret these events. Some see them mainly as democratic rebellions against oligarchic government. Others, especially in relation to Lower Canada, emphasize French-Canadian nationalism and ethnic tension. Political representation, cultural survival and economic grievances were closely connected.

### The Durham Report and its implications

Durham’s *Report on the Affairs of British North America* appeared in 1839. It identified defective colonial government as a central cause of the unrest and recommended **responsible government**. Under this system, the executive would depend on support from the elected assembly instead of governing independently of it.

Durham also proposed uniting Upper and Lower Canada. He believed union would improve administration and encourage the assimilation of French Canadians into an English-speaking political community. That cultural judgement made the report deeply controversial in French Canada.

The Act of Union of 1840 took effect in 1841 and created the Province of Canada. It was divided administratively into Canada West and Canada East. Each section received equal representation, even though their populations were different. Their finances were combined, so Lower Canada also became responsible for Upper Canada’s larger debt.

Union did not remove French-Canadian political influence. Reform politicians formed cross-cultural alliances, most notably through the partnership of Robert Baldwin and Louis-Hippolyte LaFontaine. Responsible government was effectively achieved in 1848, when the governor accepted ministers who held majority support in the elected assembly. Britain kept imperial sovereignty while allowing the colonies greater self-government.

### Challenges leading to Confederation

By the 1860s, repeated political deadlock was causing problems in the Province of Canada. Equal representation for Canada East and Canada West had once protected French Canadians. However, population growth in Canada West led George Brown and his supporters to call for representation by population. Many people in Canada East feared that this would leave them exposed to an English-speaking Protestant majority.

Economic factors also encouraged union. Railway construction and an intercolonial market promised stronger links between the colonies. Britain’s shift towards free trade, including the repeal of the Corn Laws, weakened older imperial advantages. When the Canadian–American Reciprocity Treaty ended in 1866, interest in trade within British North America increased.

Security raised another concern. The American Civil War showed the military strength of the United States. The Trent Affair of 1861 produced an Anglo-American crisis, while Fenian raids from the United States in 1866 added to fears about defence. Britain increasingly expected the colonies to take greater responsibility for their own security.

Confederation still faced major obstacles. The colonies had different economies, debts and transport requirements. Some feared increased taxation or domination by the more populous Province of Canada. French Canadians wanted safeguards for their language, religion and civil law. Maritime critics doubted that union would help their trade, and political leaders disagreed about how to divide federal and provincial powers.

Delegates discussed union at the Charlottetown and Quebec Conferences of 1864. The London Conference began in December 1866 and continued into March 1867, completing the plan. Newfoundland and Prince Edward Island did not join in 1867. Opposition was particularly strong in Nova Scotia, even though it entered the new federation.

### The British North America Act of 1867

The British North America Act took effect on 1 July 1867. It created the Dominion of Canada from Ontario, Quebec, New Brunswick and Nova Scotia. John A. Macdonald became the first prime minister. Canada gained domestic self-government within the British Empire, while Britain kept control over constitutional amendment and important imperial matters.

The Act created a federal parliamentary system. The central Parliament consisted of the Crown, an appointed Senate and an elected House of Commons. Representation in the Commons was broadly based on population. Senate seats, by contrast, were distributed by region.

The division of federal and provincial powers was a central compromise. The federal government controlled defence, trade and commerce, banking, criminal law and other matters of national concern. Provinces controlled areas such as education, property and civil rights, along with local institutions. Quebec therefore retained authority over institutions important to its French-speaking Catholic identity and preserved its civil-law tradition.

Macdonald had wanted a strongly centralized union. The Act gave the federal government residual authority, as well as the power to disallow provincial legislation and appoint lieutenant-governors. Federalism remained essential, however, because French Canadians and the Maritime colonies would not have accepted a purely legislative union.

### Unresolved issues, regionalism and effects

Confederation did not end regionalism. Nova Scotian opponents began an anti-Confederation campaign. They argued that the arrangement had been accepted without a direct popular mandate and would place Maritime interests under the control of central Canada. New Brunswick also saw sharp political conflict before entering.

Relations between English- and French-speaking Canadians remained unsettled. Provincial powers protected important parts of Quebec’s identity, but disputes over education, religion, minority rights and federal authority continued. Indigenous peoples were not partners in the constitutional negotiations, although federal expansion would have major effects on their lands and political autonomy.

The Act also left Canada constitutionally connected to Britain. Canadian governments controlled most internal affairs, but Canada could not yet amend its constitution entirely on its own. Imperial authority also remained relevant to foreign policy.

Confederation replaced the political structure of the Province of Canada, ended the earlier deadlock and created a framework for territorial expansion. Manitoba joined in 1870 after the Red River resistance and negotiations with the provisional government led by Louis Riel. The new federation was still a negotiated and contested union. It balanced population with regional representation, central authority with provincial autonomy, and common defence with distinct local identities.

Independence movements (1763–1830)

History

IB History develops students' understanding of significant historical events, themes, and interpretations across different periods and regions.Students learn to analyze historical sources critically, understand complex historical narratives, and develop sophisticated historical thinking skills.

HL2.7 Nation-building and challenges (c1780–c1870)

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