The Americans knew they were defeated. They surrendered and the Cuban military kept them for questioning before getting direct orders from Castro to kill them. They were publicy executed by Castro for trying to invade his country. The pesident, in response, asked congress to go to war, which they did. They needed to show communism could not stand and knew that Castro killed the Americans to strengthen his ties with the USSR. America launched a full scale assualt on cuba and the war then spread into Europe. The war then escalated and other countries were eventually involved for moral reasons. With all of Europe and America at war, China thought they could be allies and wage war against America and eventually nucleur weapns were used to this left most of the civilized world in ruins. With the irradiated and the only remains of human civilizatin being small island countries other secluded peoples. With the smartest people of the land unusable, humanity was doomed.