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There were many countries that fought with us (on our side) in World War One. Assuming you mean the United States as "us," we were part of the Allied Nations. We joined the war in April of 1917 with countries including Great Britain, Russia and France for the most part. There were many other minor countries on our side such as Japan and Italy.

We were against the Alliance of Germany, Austria-Hungary, and Turkey.

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14y ago

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