Jules,
Here's the quick history lesson, basically, the previous government was very favorable to the US and I think we even had a Ford plant there. Fidel and his party (group) started a revolution because of corruption, poor living conditions, etc. and took over. when they took over they felt that the US was somewhat to blame for their situation (going back to the Spanish-American War in the late 1800's when the US helped Cuba to become independant) anyway so when Fidel took over he kicked us out, of course then we had the cuban missile crisis, bay of pigs when JFK was prez. Communism was involved with our break with cuba during the cold war and now we are not allowed to travel there, except the military going to Guantanamo Bay.
Okay sorry to rant, but I am a history teacher.