Correct answer: CUBA
Detail:
Communist revolutionaries, led by Fidel Castro, overthrew the government of Fulgencio Batista in 1959. Castro then led Cuba as a communist state from 1959 to 2008. His brother, Raul Castro, took over the leadership position in 2008 due to Fidel's ailing health. (Fidel Castro died in 2011.) During the Cold War years, Cuba became allied with the Soviet Union. The Cuban Missile Crisis in 1962 was an example of communist tensions that occurred very close to the United States due to Cuba's connection with the USSR.
France had an active communist party in its politics in the 20th century, but never became a communist state.