The Acadians (French: Acadiens; European French: [akadjɛ̃], Acadian French: [akad͡zjɛ̃]) are an ethnic group descended from the French who settled in the New France colony of Acadia during the 17th and 18th centuries. Today, most descendants of Acadians live in either the Northern American region of Acadia, where descendants of Acadians who escaped the Expulsion of the Acadians (known as The Great Upheaval, Le Grand Dérangement) re-settled, or in Louisiana, where thousands of Acadians moved in the late 1700s. Descendants of the Louisiana Acadians are most commonly known as Cajuns, the anglicized term of "Acadian".
Acadia was one of the five regions of New France, located in what is now Eastern Canada's Maritime provinces, as well as parts of Quebec and present-day Maine to the Kennebec River. It was ethnically, geographically and administratively different from the other French colonies such as the French colony of Canada. As a result, the Acadians developed a distinct history and culture. The settlers whose descendants became Acadians primarily came from the west-central region of France, such as the rural areas of Poitou-Charentes. During the French and Indian War (known in Canada as The Seven Years' War), British colonial officers suspected that Acadians were aligned with France, after finding some Acadians fighting alongside French troops at Fort Beauséjour. Though most Acadians remained neutral during the war, the British, together with New England legislators and militia, carried out the Great Expulsion (Le Grand Dérangement) of the Acadians between 1755 and 1764. They forcefully deported approximately 11,500 Acadians from the maritime region. Approximately one-third perished from disease and drowning. In retrospect, the result has been described as an ethnic cleansing of the Acadians from Maritime Canada.