Due in 9 minutes. Please help me asap! How did the atomics arms race between the U. S. and Soviet Union begin?

Originally, only the United States had atomic bombs, but an atomic bomb detonated in 1949 in the Soviet Union and the arms race began. More and bigger explosives began to be constructed by both nations.

Explanation:

under god i have placed my chiest strentgh and the safe guard to my loyal subjects

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