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:
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Explanation:
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About 10% had been colonized by that time
<span>The entry of the United States into the First World War in April 1917 as an “associate”—not ally—of the Allies, was more than just a response to submarine warfare; it also reflected the vision of President Woodrow Wilson.</span>