The US trained exiles from Cuba to kill the leader of Cuba (Fidel Castro) and when they were dropped of the mission failed , this was known as the “bay of pigs” the people were shot and killed . The Cubans ever since then had a missile pointed toward the United States by the Soviet Union. There was fear that the missile would be released and hit the US.
due to the amount of slaves the south would recive the southers decided to help in the civil war. Their economy mainly depends on slaves