Its D) The U.S. had evidence of a threat to national security.
Tensions between the United States and the Soviet Union over Cuba had been steadily increasing since the failed April 1961 Bay of Pigs invasion, in which Cuban refugees, armed and trained by the United States, landed in Cuba and attempted to overthrow the government of Fidel Castro
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The answer is : True
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Answer:South Vietnam was overtaken by North Vietnam, and Vietnam became a single communist nation.
Explanation:
The US had been supporting South Vietnam against the communist North Vietnam. Ultimately, US President Richard Nixon proposed drawing down US involvement in the war and seeking "peace with honor," as he put it.
Once the US forces withdrew (after a long, unsuccessful struggle), it was too late for the South Vietnamese to stave off the victory of the North Vietnamese and Viet Cong forces. The US withdrew its forces from Vietnam in 1973. By 1975, Saigon, the capital of South Vietnam, fell to the North Vietnamese communist forces. South Vietnam unconditionally surrendered to North Vietnam on April 30, 1975. All of Vietnam became united under communist control.
