Between 1763 and 1830, colonies across the Americas broke away from their European rulers. Historians look for causes in four categories: political, economic, social and religious. No single cause explains everything — you need to show how they combined.
- Political causes — colonists in British North America and Spanish America had no real voice in decisions made about them (no taxation without representation in the British case); creole elites in Latin America were blocked from the top jobs, which went to peninsulares (Spanish-born officials)
- Economic causes — Britain's Navigation Acts and new taxes (Stamp Act 1765, Townshend Duties 1767) restricted colonial trade and raised revenue after the costly Seven Years' War; Spain's Bourbon Reforms tightened tax collection and trade monopolies, angering Latin American merchants and landowners
- Social causes — a growing class of American-born colonists (Creoles in Latin America, colonists in British America) resented being treated as second-class subjects of a distant monarch
- Religious causes — weaker in British America (already religiously diverse) but present in Latin America, where some clergy resented Spanish crown control over the Catholic Church (the patronato real)
Enlightenment ideas gave the causes a language: Thinkers like John Locke (natural rights — life, liberty, property), Montesquieu (separation of powers) and Rousseau (the social contract — government exists only with the consent of the governed) gave colonists a vocabulary to justify rebellion. Educated Creoles and colonists read these ideas and used them to argue that unjust rule could be resisted.
Foreign intervention mattered too. France, angry at losing the Seven Years' War to Britain, secretly funded and then openly allied with the American rebels after 1778 — decisive to their success. In Latin America, Napoleon's 1808 invasion of Spain (removing the Spanish king) triggered a crisis of authority that opened the door to independence movements a generation later.
Structure your causes paragraph: For a Paper 3 essay, never list causes — rank and link them. Example: "While Enlightenment ideas provided the justification, it was the economic grievance of taxation that turned resentment into action." This shows the examiner you understand causation, not just facts.
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The Thirteen Colonies moved from protest to full rebellion in just over a decade. Understanding this timeline is essential for explaining why the Declaration of Independence happened when it did, not earlier or later.
1765 — Stamp Act crisis
Britain's first direct tax on colonists sparked the slogan 'no taxation without representation' and colonial boycotts; repealed in 1766 but trust was already damaged
1770 — Boston Massacre
British troops fired on a crowd in Boston, killing five; used by radicals like Samuel Adams as propaganda showing British 'tyranny'
1773 — Boston Tea Party
Colonists dumped British tea into Boston harbour to protest the Tea Act; Britain responded with the punitive Intolerable Acts (1774)
1775 — Lexington and Concord
First shots of armed conflict between colonial militia and British troops; fighting had begun before independence was even declared
1776 — Declaration of Independence
The Second Continental Congress adopted Thomas Jefferson's Declaration on 4 July, formally breaking from Britain and citing Enlightenment natural-rights language
Tax → Massacre → Tea → Shots → Declaration: grievance escalates into war, and only then into a formal break.
What the Declaration actually argues: The Declaration of Independence is built on Locke's natural rights theory.
Its argument in three parts
- All men have unalienable rights to "life, liberty and the pursuit of happiness".
- When a government violates these rights, the people have the right to "alter or abolish it".
- Most of the document is a long list of grievances against King George III, presented as legal justification — not just anger.
George Washington was the political and military anchor of the Revolution. As commander of the Continental Army from 1775, he held together an under-supplied, poorly trained force through repeated defeats, most famously surviving the brutal winter at Valley Forge (1777–78) without his army disintegrating. His personal discipline and refusal to seize dictatorial power (unlike many revolutionary generals elsewhere) gave the new republic crucial legitimacy.
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Declaring independence was one thing — winning the war was another. The military campaigns of 1776–1781 explain why the colonists actually succeeded against the world's strongest navy and a professional army.
| Campaign / event | Year | Significance |
|---|---|---|
| New York campaign | 1776 | Washington narrowly escaped disaster after British victories; showed the Continental Army could survive defeat |
| Trenton and Princeton | 1776–77 | Washington's surprise crossing of the Delaware River revived morale after a string of losses |
| Saratoga | 1777 | Decisive American victory; convinced France it was worth openly allying with the rebels |
| Franco-American alliance | 1778 | France supplied money, troops, and its navy — turning a colonial rebellion into a global war against Britain |
| Yorktown | 1781 | Combined American and French forces trapped General Cornwallis; his surrender effectively ended the war |
| Treaty of Paris | 1783 | Britain formally recognized United States independence |
Why foreign intervention was decisive: Without France's money, weapons, troops and navy after 1778, the colonists likely could not have defeated Britain. Saratoga (1777) is the hinge point: it was a battlefield win, but its real significance was diplomatic — it persuaded France to intervene openly.
- Geography and distance — Britain had to supply and reinforce an army across 3,000 miles of ocean, slowing responses and raising costs
- Guerrilla-style resilience — the Continental Army did not need to win every battle, only to survive and keep the rebellion alive
- Leadership — Washington's steady command contrasted with changing, sometimes overcautious British generals
- Foreign support — French (and later Spanish and Dutch) involvement turned a local rebellion into a war Britain could not afford to keep fighting
Bolivar and San Martin — coming in part 2: The Latin American leaders Simon Bolivar and Jose de San Martin led parallel independence struggles a generation later (1810s–1820s), partly inspired by the American and French revolutions. Their campaigns, and the similarities/differences between Latin American independence and the American Revolution, are covered in the next micro (19.6.2).