I can't speak for the Guantanamo instance, but I can say that the US didn't use loans as leverage to build military bases. In most of the cases you cite they w

I can't speak for the Guantanamo instance, but I can say that the US didn't use loans as leverage to build military bases. In most of the cases you cite they were put there to contain the Soviet Union and its allies. Often the national governments involved wanted or felt they needed the Americans (even if there were local reservations).