Originally the United States only had atomic weapons, but that all changed when in 1949 the U.S.S.R (or the Soviet Union) set off an atomic bomb, which started the Nuclear Arms race.
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Answer:rapid growth of urban areas
Explanation:
If a bill has passed in both the U.S. House of Representatives and the U.S. Senate and has been approved by the President, or if a presidential veto has been overridden, the bill becomes a law and is enforced by the government.
It was b. Farmers moved to cities to look for factory jobs, which were unsafe, with long hours
