Louisiana.
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Lousiana
No, Cambodia used to be a French colony.
Algeria.
Guiana is a French colony located in northern South America. It is a small colony and located in a tropical region. The natives speak French and the colony used to be considered part of the Caribbean, but now is not.
It used to be a French colony and it is now a "French Collectivity". It is not an independent country.
Because Vietnam used to be a French colony.
France claimed the territory of Louisiana as a colony, but that territory was far larger than the present-day state of Louisiana. Arkansas, Missouri, and Iowa at least were all wholly in French Louisiana.
Louisiana is a state in the US with French influence, due to its history as a French colony. French culture, language, and cuisine have had a significant impact on Louisiana's identity.
French is spoken in Louisiana due to its history as a French colony, with areas like New Orleans being founded by French settlers. Additionally, the presence of Creole communities that speak a form of French also contributes to its prevalence in the state. Louisiana's unique cultural mix has helped maintain the French language in certain regions.
Haiti, the Ivory coast, Senegal, Algeria or Vietnam are all former French colonies. And there are more other countries, especialy in Africa.