Why did fidel Castro have problems with the US?

Answer 1

Fidel Castro and his forces overthrew the US friendly government in Cuba. He then declared Cuba a communist state and confiscated US assets. These two acts were seen as unacceptable by the United States, which was in a protracted "Cold" war with the Soviet Union and its Communist satellites and protectorates. Many Cubans, large numbers of the middle and upper middle class, fled Cuba for the United States. The United States then sponsored Cuban forces to return and overthrow Castro's government. The attempt was called "The Bay of Pigs" and was a resounding failure and embarrassment to the US government. To compound the tension the US government later found that the Soviet Union was in the process of installing Nuclear weapons pointing at the mainland United States on Cuba, thus beginning what is known in the US as "The Cuban Missile Crisis". The US blockaded Cuba and demanded that the USSR remove the missiles bringing the US & USSR very close to a nuclear war. The combination of these events, and the political strength of the Cuban exile community in Florida, where most settled, has hampered normalization of relations between the two ever since.

Answer 2

Because he sided with Russia during the Cold War and refused to subscribe to American norms such as democracy and capitalism