Answer:
The Cuban Revolution led to the deterioration of relations between the two countries, and diplomatic ties were broken on January 3, 1961 after the Eisenhower administration rejected a demand from Fidel Castro to reduce the number of US embassy personnel in Havana.
Step-by-step explanation:
The Cuban Revolution was an armed revolt in the mid 20th century. It was led by Fidel Castro against the government of Fulgencio Batista. This government changed along communist lines, and became the Communist Party of Cuba in October 1965.