When American troops finally arrived in Europe:

Question

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American troops arrived in Europe in significant numbers in the spring of 1918. They helped push back a significant German offensive near Paris in the summer of 1918, but their arrival alone did not completely turn the tide of the war. The Meuse-Argonne campaign took place later that fall, and although American troops played a significant role, they were not present for the entirety of the campaign. The American-led organization of alliances after the war (the League of Nations) did not occur until after the war had ended.

When American Troops Finally Arrived in Europe