SELECT ALL THAT APPLY. In 1949, what two major events occurred, leading to the escalation of the Cold War?

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The communist victory in the Chinese Civil War brought another major power under communist control, leading to further tension between the United States and Soviet Union. Additionally, the testing of the Soviet Union's first nuclear weapon signaled the beginning of the nuclear arms race and a significant increase in fear of nuclear war. The assassination of U.S. President John F. Kennedy and the drafting of Kennan's long telegram both occurred earlier, in 1947 and 1946 respectively, and did not directly contribute to the escalation of the Cold War in 1949.