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I'm more leaning towards C but it might be D. I'm sorry if I didn't really fjdjdbd
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The Domino Theory was based on the idea that communism was a contagious force that spread from country to country. It was first advanced during Harry S. Truman's presidency, when WW2 ended, as the United States adopted the policy of Containment to restrict communist expansion and the sphere of influence held by the USSR.
When the United States entered World War Two, There two allies of Germany were Italy and Japan. Mussolini and Hitler had met and signed a treaty,same with japan.
