United States-Cuba Relations and the Economies Economic sanctions can be and are a valuable tool for enforcing international norms and protecting our national interests. The U.S. Policy of applying economic pressure in Cuba originated soon after Fidel Castro came into power in 1959. The United States first imposed a full trade embargo on Cuba on February 3, 1962, after the Kennedy Administration became convinced that Castro was moving rapidly toward the establishment of a totalitarian regime in alliance with the Soviet Union. Castro had not ....