The Soviet Union's first atomic test in 1949 influenced US foreign policy, aid to Western Europe, and the development of advanced nuclear weapons.
The Soviet Union's first successful atomic test in 1949 had a significant impact on the United States during the Cold War period. The event prompted the Truman administration to pursue a policy of containment in response to the Soviet nuclear threat. It also spurred Congress to increase Marshall Plan aid to Western Europe and led to the development of the hydrogen bomb by the United States, initiating a nuclear arms race.
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