The u. s. rejected membership in the league of nations because members of the u. s. senate believed that the

The United States was opposed to the League of Nations because it contained a clause requiring member nations to commit troops if need be. The Senate wanted this amended and it was not. America had suffered civilian casualties in the war, and many people in the USA wanted to keep America out of European affairs.

the decreasing neutrality of the u. s. in world war i

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united states reinforcements contributed greatly to three allied victories in france at: cantigny (first major american battle), argonne (the largest in the united states military history, involving 1.2 million american soldiers), and château-thierry (one of the first actions under general pershing).