French and Indian War
The French and Indian War is the common U.S. name for the war between Great Britain and France in North America from 1754 to 1763. In 1756 the war erupted into the world-wide conflict known as the Seven Years' War and thus came to be regarded as the North American theater of that war. In Canada, it is usually just referred to as the Seven Years' War, although French speakers in Quebec often call it La guerre de la Conquête ("The War of the Conquest").  In Europe, there is no specific name for the North American part of the war. The name refers to the two main enemies of the British: the royal French forces and the various American Indian tribes allied with them.
The war was fought primarily along the frontiers between the British colonies from Virginia to Nova Scotia, and began with a dispute over the confluence of the Allegheny and Monongahela Rivers, the site of present-day Pittsburgh, Pennsylvania. The dispute resulted in the Battle of Jumonville Glen in May 1754. British attempts at expeditions in 1755, 1756, and 1757 in the frontier areas of Pennsylvania and New York all failed, due to a combination of poor management, internal divisions, and effective French and Indian offense. The 1755 capture of Fort Beauséjour on the border separating Nova Scotia from Acadia was followed by a British policy of deportation of its French inhabitants, to which there was some resistance.
After the disastrous 1757 British campaigns (resulting in a failed expedition against Louisbourg and the Siege of Fort William Henry, which was followed by significant Indian atrocities), the British government fell, and William Pitt came to power, while France was unwilling to risk large convoys to aid the limited forces it had in New France. Pitt significantly increased British military resources in the colonies, and between 1758 and 1760 the British military successfully penetrated the heartland of New France, with Montreal finally falling in September 1760.
The outcome was one of the most significant developments in a century of Anglo-French conflict. To compensate its ally, Spain, for its loss of Florida to the British, France ceded its control of French Louisiana west of the Mississippi. France's colonial presence north of the Caribbean was reduced to the tiny islands of Saint Pierre and Miquelon, confirming Britain's position as the dominant colonial power in the eastern half of North America.