Following the Cuban missile crisis, the Bay of Pigs invasion, and the nationalization of U.S. property by the Castro regime, the United States imposed sanctions on Cuba in 1963. TWEA sanctions continued throughout the Cold War because the US and Cuba often found themselves on opposite sides in various proxy conflicts throughout Latin America and Africa. The sanctions on Cuba were increased after the Cuban air force killed American protesters who were known to violate Cuban airspace. Cuba is currently the only state still under sanctions under TWEA.