Answer:
After the Cuban Revolution, the United States was concerned Cuba was becoming a Communist country.
Explanation:
On January 1, 1959, Fidel Castro triumphantly entered Santiago de Cuba, declaring it the provisional capital of Cuba and proclaiming the magistrate Manuel Urrutia Lleo as president of the nation. For the moment, the United States government recognized the revolutionary government.
On May 17, 1959 Fidel Castro signed the promised law of agrarian reform in the Sierra Maestra. Then a process of expropriations, nationalizations and confiscation of ill-gotten goods that strongly affected the upper class and some American companies as well as other countries was opened. Initially the revolutionary government offered indemnities but in the case of the United States they were not accepted.
As a consequence of these expropriations and to weaken the recently established communist regime, the United States imposed a commercial, economic and financial embargo on Cuba in October 1960, which continues to this day.