Louisiana is one of the 50 states of the United States. Formerly a French and later Spanish colony, it was sold to the United States by Napoleon. But there are still remnants of its former status as a possession of France, including: the use of a civil law legal system, the Napoleonic Code (like France, and unlike the rest of the United States, which uses a common law legal system derived from England), the term parishes being used to describe the state's self-divisions as opposed to counties, etc.
See also Louisiana Purchase.
What about the creoles or cajuns?
Ethnically, the cajuns are from Acadia, an area in the New Foundland province of Canada. When the British won the French and Indian War, The British forced all of the citizens to take a pledge of allegiance. The Acadians would not and were force out of Canada, most of the fleesing to the souther portion of Louisiana.
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