Political map of North America & the Caribbean 24 October 1962 (Cuban Missile Crisis): US–Cuban relations quickly deteriorated as Castro (Fidel Castro)'s new regime cracked down on the influence of foreign businesses and supported revolution abroad. In 1961 the US backed Cuban exiles in an attempt to overthrow Castro by landing at the Bay of Pigs (Bay of Pigs Invasion), only to be repelled by the Cuban Army. Cuba responded by aligning with the Soviet Union and secretly hosting nuclear missiles capable of reaching the US mainland (Operation Anadyr). When the US discovered the missiles, it confronted the Soviets in a tense standoff that threatened all-out nuclear war (Cuban missile crisis) but was ultimately defused when the Soviets agreed to back down.