Hello. Your question is incomplete. You did not enter the text to which it refers, which makes it impossible for it to be answered. However, I will try to help you in the best possible way.
I believe you are referring to Fidel Castro. When it became a popular name, Cuba was going through a time of great political instability. This is because Fidel Castro carried out a political coup that succeeded in deposing the president of Cuba. In this way, he took power and established a highly oppressive system in Cuba. President Dwight Eisenhower recognized Fidel Castro as the president of Cuba, but that recognition was not made with American presidents after Dwight Eisenhower.
John Kennedy rejected Castro's political system and did not recognize him as the president of Cuba. Castro saw this as a strongly imperialist concept and affirming that Kennedy wanted to dominate Cuba, but that this would not be allowed, as Cubans do not support imperialism, just as Kennedy disapproves of socialism. This speech strongly weakened relations between the United States and Cuba.