Cuba complains a lot about U.S. control over Guantánamo Bay. Raúl Castro did so again not long ago. If you remember, the United States took it during the Spanish-American War in 1898, wrote it into a 1903 treaty, then updated it in 1934 with the aid of, among others, Fulgencio Batista.
A few short years after the Spanish-American War,
Cuba emerged not as a colony of Spain but as an
independent and sovereign republic - a change in
status made possible only thanks to U.S. military