The U.S was a major neutral country during the war but then was forced to declare war at Germany as they tried to make Mexico join the war against the U.S. As they were not in Europe, they were not directly into the Combat, they did not experience war exhaustion but rather had to adapt pro-alcohol prohibition policies to reduce wheat consumption for the war, helping Wayne Wheeler ( The leader of the Anti-Saloon league ) pressure even more the U.S. senate to make prohibition a constitutional amendment. So, it lightly impacted the U.S. but not heavily.
