The United States declared war on Germany on April 6, 1917, nearly three years after World War I started. A ceasefire and Armistice was declared on November 11, 1918. Before entering the war, the U.S. had remained neutral, though it had been an important supplier to the United Kingdom, France, and the other Allied powers.

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WWI U.S. Headgear

WWI U.S. Medals & Insignia

WWI U.S. Miscellaneous