Answer:
Relations between Cuba and the United States of America had already begun before Cuba began its actions to gain independence from Spain. There were several plans in the United States to buy Cuba from the Spanish Empire. When Spanish influence in the Caribbean waned, the United States, on the other hand, gained it in economics and politics, as well as in Cuban affairs.
Following the 1959 Cuban Revolution, relations between the two nations deteriorated and have been marked by tension ever since. From 1961 the United States and Cuba had no formal diplomatic relations and the United States maintained an embargo against Cuba, which made it illegal for U.S. companies to do business in Cuba. Diplomatic representation in this situation was maintained by the United States Interests Section in Havana, and there was a similar Cuban body in Washington D.C; both were officially part of their respective embassies in Switzerland. The United States launched an embargo on nationalizing the ownership of US companies in Cuba during the Revolution, and stated that they would continue for as long as the Cuban government refuses to pursue democratization and does not respect human rights in Cuba, meanwhile various organizations, including the UN General Assembly, almost unanimously called for an end to the U.S. embargo on Cuba.