Answer:
According to a source:
Red Scare Impact The Red Scare was hysteria over the perceived threat posed by Communists in the U.S. during the Cold War between the Soviet Union and the United States, which intensified in the late 1940s and early 1950s. (Communists were often referred to as “Reds” for their allegiance to the red Soviet flag.)
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Pearl Harbor. The atomic bombs that we dropped on Japan was revenge for Pearl Harbor. We already had some issues with Japan but the surprise attack on Pearl Harbor was the main reason for the atomic bombs that President Truman dropped on Japan.
