Because it would make one larger force to gain independence from Britain which would be an attempt to put their mark in the political spectrum of freedom
The American Expeditionary Forces arrived in Europe in 1917 and helped turn the tide in favor of Britain and France, leading to an Allied victory over Germany and Austria in November 1918. By the time of the armistice, more than four million Americans had served in the armed forces and 116,708 had lost their lives.
