The document provides background information on the Cuban Missile Crisis between the United States and Soviet Union in 1962. It explains that Cuba had established a communist government under Fidel Castro after he overthrew the US-backed dictator Batista in 1959. In 1961, the USSR began providing military support to Cuba, including missiles. This alarmed the US and increased tensions. In October 1962, US reconnaissance photos revealed Soviet missile sites under construction in Cuba, escalating the crisis. President John F. Kennedy imposed a blockade on Cuba and demanded the Soviets remove the missiles. After several tense days of negotiations, the USSR agreed to dismantle the missile sites and the crisis was resolved.