Answer:
D. The Soviets successfully tested an atomic bomb.
Explanation:
China officially fell to the communist party in 1949 after the communist took Beijing. In the same year the soviets successfully detonated there first atom bomb at Semipalatinsk Test Site, in Kazakhstan.
Mainly from Europe more specifically Germany ,Ireland, England and France due to various problems such as crop failure. Hope this helps
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Answer: Stalin wanted a buffer zone of friendly Communist countries so they could protect USSR from any further attacks in the future.
Explanation: