Same thing happened with Florida, for over 250 years Florida was a Spanish colony until the Adams-Onis treaty of 1821 when Florida was given to the US. In the case of Florida though the Spaniards for the most part moved to Cuba or one of the other Spanish colonies and settled down there , so there wasn’t much resistance to the changing of the laws like there was more so in Missouri and for Louisiana the majority of people there were called the old French, today they are called Cajun cereoles.
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