Lodge sabotaged the League covenant by declaring the United States exempt from Article X. He attached reservations, or amendments, to the treaty to this effect. Wilson, bedridden from a debilitating stroke, was unable to accept these changes. He asked Senate Democrats to vote against the Treaty of Versailles unless the Lodge reservations were dropped. Neither side budged, and the treaty went down to defeat.
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I don't have the proper answer and you might have to do research but America did gain much from the war such as Cuba, The Philipines, and Guam.
Answer:
It led to more trading partners and more industries