The Treaty of Aix-la-Chapelle ended the War of the Austrian Succession and required Britain to return the fortress of Louisbourg (on Cape Breton Island) to France. In northern North America, this settlement left major imperial disputes unresolved, especially over borders and control of trade and forts. Those tensions set the stage for renewed conflict in the 1750s.
French forces expanded a chain of forts southward from the Great Lakes toward the forks of the Ohio River. This was meant to secure communications and trade, and to strengthen France’s claim to the interior. British colonial leaders viewed the move as an encroachment and began planning their own fort-building and military response.
A Virginia force under George Washington and Native allies confronted a French detachment at Jumonville Glen. The skirmish escalated quickly, and the death of French officer Joseph Coulon de Jumonville became a major political issue between the empires. The incident is widely treated as the opening fighting of the French and Indian War in North America.
French forces compelled Washington’s troops to surrender at Fort Necessity in the Great Meadows. The written capitulation (surrender terms) was in French and later became controversial, because it characterized Jumonville’s death as an “assassination.” The defeat strengthened French control in the Ohio region and pushed both sides toward larger war.
British and New England forces captured Fort Beauséjour on the Isthmus of Chignecto, weakening French and allied militia positions in the region. This victory helped Britain tighten control over parts of Acadia (present-day New Brunswick/Nova Scotia borderlands). It also fed British fears about local loyalties during wartime.
A British army under General Edward Braddock was ambushed and badly defeated while advancing toward Fort Duquesne. The loss kept the fort in French hands and exposed the British frontier to raids and instability. It also demonstrated how European-style formations struggled in forest fighting against French and Native forces.
British authorities began deporting Acadian communities, starting with actions linked to Fort Beauséjour (renamed Fort Cumberland). The removals escalated across Nova Scotia, separating families and reshaping settlement patterns. This forced migration became known as the Great Upheaval (Le Grand Dérangement).
Britain’s successful siege of Louisbourg removed a key French Atlantic stronghold on Cape Breton Island. With Louisbourg taken, the British navy and army gained better access to the Gulf of St. Lawrence. This helped make later campaigns against Quebec and the St. Lawrence corridor possible.
As a British force under John Forbes approached, the French destroyed and withdrew from Fort Duquesne rather than be captured. The British then took control of the strategic forks of the Ohio and began establishing a new post there (Fort Pitt). The shift weakened French influence in the Ohio Valley and helped cut links between Canada and the interior.
British and Iroquois forces captured Fort Niagara after a July siege. Niagara was a major French supply and communications point connecting Canada to the Great Lakes and interior forts. Its loss made it harder for France to support allied positions and campaigns across the region.
After a lengthy siege, British troops defeated French forces outside Quebec City at the Battle of Quebec (Plains of Abraham). Both commanders, James Wolfe and the Marquis de Montcalm, were mortally wounded. The victory put Quebec City under British control and became a decisive turning point in the conquest of New France.
French forces under François-Gaston de Lévis defeated the British garrison outside Quebec at Sainte-Foy. However, the French could not capture the city before British naval support arrived, forcing the French to withdraw. The episode showed that battlefield victories mattered less without control of the St. Lawrence supply route.
French Governor Vaudreuil agreed to the Articles of Capitulation of Montreal with British General Jeffery Amherst. This surrender transferred control of Canada to Britain and began a period of British military government. It marked the effective end of New France as a French-held colony, pending the final peace treaty in Europe.
The Treaty of Paris formally ended the Seven Years’ War between Britain and France (and their allies). France renounced to Britain its mainland North American territories east of the Mississippi River, excluding New Orleans and its immediate area. In practical terms, this confirmed Britain’s conquest of Canada and reshaped imperial power in North America.
In the months after the treaty, a broad Indigenous resistance movement—often called Pontiac’s War—erupted around the Great Lakes and Ohio Valley. The conflict reflected disputes over land, diplomacy, and British military and trade policies after the French withdrawal. The violence and sieges highlighted that conquest of New France did not bring immediate stability to Britain’s new territories.
Seven Years' War and the Conquest of New France (1754–1763)