Germany had formally surrendered on November 11, 1918, and all nations had agreed to stop fighting while the terms of peace were negotiated. On June 28, 1919, Germany and the Allied Nations (including Britain, France, Italy and Russia) signed the Treaty of Versailles, formally ending the war.
Explanation:
the united states emerge as one of the two dominant, superpowers turning away from its traditional isolationism and toward increased international environment
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The Urban Areas were used to house these Immigrants and they grew larger.