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t started in 1945, when the United States exploded its first atomic bomb on July 16 in Alamogordo, N.M., after a massive research campaign known as the Manhattan Project. The successful test of the bomb led to its use on two Japanese cities in August 1945, Hiroshima and Nagasaki
Explanation:
searched it up
Answer:
Philadelphia was one of the first planned cities in the United States.
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Source: Goog|e
Madison and Jefferson formed the Democratic-Republican Party from a combination of former Anti-Federalists and supporters of the Constitution who were dissatisfied with the Washington administration's policies.