Don't forget that "Cajun" is a Louisiana way of pronouncing "Acadian." When the Brits expelled the French-speaking people of Acadia from their homeland in 1755 (and renamed it Nova Scotia), the exiles were dispersed to various North American colonies, to parts of France, and to French-speaking colonies in the Caribbean. A bunch of them wound up in the bayous country of southern Louisiana. Another large group went up the St. John River and settled in a backwoods area between Quebec and nornern Maine -- out of reach of the British Navy. Sometimes the Acadians of Maine have big family reunions, attended by kinfolk from Lousiana. When the fiddle bows get to flying you can hear the similarities and differences between the present day Acadian and Cajun styles. In my opinion, the butt-shaking zydeco style evolved when French-speaking and non-French speaking African-Americans in Louisiana began jamming with their Cajun neighbors and adding some of their own musical traditions to the jambalaya.