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What is the earliest point that the United States could enter WWI feasibly, and how big of a change would it make in the war? I'm particularly interested in the US coming into the war in 1914, 1915, or 1916.

What affect would it have on the war, i.e., how quickly would American help on the Entente side turn the tide of the war? What would the peace treaty look like if the war ended earlier, and if the Americans had lost more men than they had OTL would Wilson still be as peace-loving? How would this affect Europe post-WWI?
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