The war changed economic, political, governmental and social relations between three European powers (Britain, France, and Spain), their colonies and colonists, and the natives that inhabited the territories they claimed. France and Britain both suffered financially because of the war, with significant long-term consequences. 


Britain gained control of French Canada and Acadia, colonies containing approximately 80,000 primarily French-speaking Roman Catholic residents. The deportation of Acadians beginning in 1755 resulted in land made available to migrants from Europe and the colonies further south. The British resettled many Acadians throughout its North American provinces, but many went to France, and some went to New Orleans, which they had expected to remain French. Some were sent to colonize places as diverse as French Guiana and the Falkland Islands; these latter efforts were unsuccessful. Others migrated to places like Saint-Domingue, and fled to New Orleans after the Haitian Revolution. The Louisiana population contributed to the founding of the modern Cajun population. (The French word "Acadien" evolved to "Cadien", then to "Cajun".)

Most of the fighting between France and Britain in continental North America ended in 1760, while the fighting in Europe continued. The notable exception was the French seizure of St. John's, Newfoundland. When General Amherst heard of this surprise action, he immediately dispatched troops under his nephew William Amherst, who regained control of Newfoundland after the Battle of Signal Hill in September 1762.

Many troops from North America were reassigned to participate in further British actions in the West Indies, including the capture of Spanish Havana when Spain belatedly entered the conflict on the side of France, and a British expedition against French Martinique in 1762.

General Amherst also oversaw the transition of French forts in the western lands to British control. The policies he introduced in those lands disturbed large numbers of Indians, and contributed to the outbreak in 1763 of the conflict known as Pontiac's Rebellion. This series of attacks on frontier forts and settlements required the continued deployment of British troops, and was not resolved until 1766.

The war in North America officially ended with the signing of the Treaty of Paris on February 10, 1763, and war in the European theatre of the Seven Years' War was settled by the Treaty of Hubertusburg on February 15, 1763. The British offered France a choice of either its North American possessions east of the Mississippi or the Caribbean islands of Guadeloupe and Martinique, which had been occupied by the British. France chose to cede Canada, and was able to negotiate the retention of Saint Pierre and Miquelon, two small islands in the Gulf of St. Lawrence, and fishing rights in the area. The economic value of the Caribbean islands to France was greater than that of Canada because of their rich sugar crops, and they were easier to defend. The British, however, were happy to take New France, as defense was not an issue, and they already had many sources of sugar. Spain, which traded Florida to Britain to regain Cuba, also gained Louisiana, including New Orleans, from France in compensation for its losses. Navigation on the Mississippi was to be open to all nations.

The British formed an aggressive plan of operations for 1755. General Braddock was to lead the expedition to Fort Duquesne. While the Massachusetts provincial governor William Shirley was given the task of fortifying Fort Oswego and attacking Fort Niagara, Sir William Johnson was to capture Fort St. Frédéric (at present-day Crown Point, New York), and Lieutenant Colonel Robert Monckton was to capture Fort Beauséjour on the frontier between Nova Scotia and Acadia. 

Colonel Monckton, in the only true British success that year, captured Fort Beauséjour in June 1755, cutting the Frenchfortress at Louisbourg off from land-based reinforcements. To cut vital supplies to Louisbourg, Nova Scotia's Governor Charles Lawrence ordered the deportation of the French-speaking Acadian population from the area. Monckton's forces, including companies of Rogers' Rangers, forcibly removed thousands of Acadians, chasing down many who resisted, and sometimes committing atrocities. More than any other factor, the cutting off of supplies to Louisbourg led to its demise. The Acadian resistance, in concert with native allies, including the Mi'kmaq, was sometimes quite stiff, with ongoing frontier raids (against Dartmouth and Lunenburg among others). Other than the campaigns to expel the Acadians (ranging around the Bay of Fundy, on the Petitcodiac and St. John rivers, and Île Saint-Jean), the only clashes of any size were at Petitcodiac in 1755 and at Bloody Creek near Annapolis Royal in 1757.

Following the death of Braddock, William Shirley assumed command of British forces in North America. At a meeting in Albany in December 1755, he laid out his plans for 1756. In addition to renewing the efforts to capture Niagara, Crown Point and Duquesne, he proposed attacks on Fort Frontenac on the north shore of Lake Ontario and an expedition through the wilderness of the Maine district and down the Chaudière River to attack the city of Quebec. Bogged down by disagreements and disputes with others, including William Johnson and New York's Governor Sir Charles Hardy, Shirley's plan had little support.

Newcastle replaced him in January 1756 with Lord Loudoun, with Major General James Abercrombie as his second in command. Neither of these men had as much campaign experience as the trio of officers France sent to North America.

The Forbes Expedition was a British campaign in September–October 1758, with 6,000 troops led by General John Forbes to drive the French out of the contested Ohio Country. After a British advance party on Fort Duquesne was repulsed on September 14, the French withdrew from Fort Duquesne, leaving the British in control of the Ohio River Valley. The great French fortress at Louisbourg in Nova Scotia was captured after a siege.

The third invasion was stopped with the improbable French victory in the Battle of Carillon, in which 3,600 Frenchmen famously and decisively defeated Abercrombie's force of 18,000 regulars, militia and Native American allies outside the fort the French called Carillon and the British called Ticonderoga. Abercrombie saved something from the disaster when he sent John Bradstreet on an expedition that successfully destroyed Fort Frontenac, including caches of supplies destined for New France's western forts and furs destined for Europe. Abercrombie was recalled and replaced by Jeffery Amherst, victor at Louisbourg.

British victories continued in all theaters in the Annus Mirabilis of 1759, when they finally captured Ticonderoga, James Wolfe defeated Montcalm at Quebec (in a battle that claimed the lives of both commanders), and victory at Fort Niagara successfully cut off the French frontier forts further to the west and south. The victory was made complete in 1760, when, despite losing outside Quebec City in the Battle of Sainte-Foy, the British were able to prevent the arrival of French relief ships in the naval Battle of the Restigouche while armies marched on Montreal from three sides.

In June 1747, concerned about the incursion and expanding influence of British traders such as George Croghan in the Ohio Country, Roland-Michel Barrin de La Galissonière, the Governor-General of New France, ordered Pierre-Joseph Céloron to lead a military expedition through the area. Its objectives were to confirm the original French claim to the territory, determine the level of British influence, and impress the Indians with a French show of force.

Céloron's expedition force consisted of about 200 Troupes de la marine and 30 Indians. The expedition covered about 3,000 miles (4,800 km) between June and November 1749. It went up the St. Lawrence, continued along the northern shore of Lake Ontario, crossed the portage at Niagara, and then followed the southern shore of Lake Erie. At the Chautauqua Portage (near present-day Barcelona, New York), the expedition moved inland to the Allegheny River, which it followed to the site of present-day Pittsburgh. There Céloron buried lead plates engraved with the French claim to the Ohio Country. Whenever he encountered British merchants or fur-traders, Céloron informed them of the French claims on the territory and told them to leave.

The French and Indian War (1754–1763) is the American name for the North American theater of the Seven Years' War. The war was fought primarily between the colonies of British America and New France, with both sides supported by military units from their parent countries of Great Britain and France, who declared war on each other in 1756. In the same year, the war escalated from a regional affair into a world-wide conflict.

The name refers to the two main enemies of the British colonists: the royal French forces and the various Indigenous forces allied with them