It was when the united states purchased the states around nebraska and missouri.
I think that the answer is C
Could you be more specific please? "Three of the following", what are the choices?
The answer you looking for would be A Damascus to Caesarea.
Superpower tensions culminated in the Cuban Missile Crisis of October 1962, as the Soviet Union sought to install medium-range nuclear missiles in Cuba, about 90 miles from the U.S. coast. Cuban Prime Minister Fidel Castro was reluctant to accept the missiles, and, once he was persuaded, warned Khrushchev against transporting the missiles in secret.
On 16 October, Kennedy was informed that U-2 flights over Cuba had discovered what were most likely medium-range missile sites, and though he and his advisors considered approaching Khrushchev through diplomatic channels, could come up with no way of doing this that would not appear weak. On 22 October, Kennedy addressed his nation by television, revealing the missiles' presence and announcing a blockade of Cuba. Informed in advance of the speech but not the content, Khrushchev, and his advisors feared an invasion of Cuba. Even before Kennedy's speech, they ordered Soviet commanders in Cuba that they could use all weapons against an attack—except atomic weapons.
As the crisis unfolded, tensions were high in the U.S.; less so in the Soviet Union, where Khrushchev made several public appearances and went to the Bolshoi Theatre to hear American opera singer Jerome Hines, who was then performing in Moscow. By 25 October, with the Soviets unclear about Kennedy's full intentions, Khrushchev decided that the missiles would have to be withdrawn from Cuba. Two days later, he offered Kennedy terms for the withdrawal. Khrushchev agreed to withdraw the missiles in exchange for a U.S. promise not to invade Cuba and a secret promise that the U.S. would withdraw missiles from Turkey, near the Soviet heartland. As the last term was not publicly announced at the request of the U.S. and was not known until just before Khrushchev's death in 1971, the resolution was seen as a great defeat for the Soviets and contributed to Khrushchev's fall less than two years later.
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