Which development resulted most directly from American involvement in Vietnam? A. Increased peace efforts between the United States and the Soviet Union
B. The fall of Vietnam and surrounding countries to communism
C. An increased sense of political nationalism in the United States
D. The withdrawal of the United States from global anticommunist efforts

in 1862, president lincoln's emancipation proclamation opened the door for african americans to enlist in the union army. although many had wanted to join the war effort earlier, they were prohibited from enlisting by a federal law dating back to 1792.

explanation:

the map that was shown mostly had eastern asia highlighted. the answer would mostly likely be "the spread of communism into eastern asia set the stage for the korean war."

hopefully this .