America pivots from neutrality to decisive intervention, tipping WWI toward Allied victory.
US stance shifts from neutrality to mounting concern as submarine warfare threatens American interests.
Unrestricted U-boat attacks and the Zimmermann telegram push the US toward entering the conflict.
America retools industry and manpower, launches convoys, and deploys the American Expeditionary Forces.
Russia exits; Germany redirects focus to the West, launching the Spring Offensive that strains resources.
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