The U.S.’s entry into World War I was anything but certain. When hostilities first broke out in Europe, then President Wilson called for neutrality. While there were some who favored supporting Britain because of ethic and cultural similarities, neutrality was very popular in the beginning. When Germany entered Belgium in 1914, the U.S. began making loans to Britain and France, but Wilson kept the army scaled down in hopes of dissuading any military involvement. While this was going on however, American industrialists made millions from war profiteering by providing powder, munitions and armor to the armies squaring off in Europe.
However, when Germany sought an alliance with Mexico through the Zimmerman Note and began unrestricted U-Boat warfare in the Atlantic, public opinion swung the other direction and the U.S. entered the War in 1917.
Once on the battlefield, our war-weary allies warmly welcomed American troops. U.S. troops provided much needed support that Germany’s already stretched armies could not counter. The U.S. helped turn back the German offensive in the spring of 1918 and also spearhead the Hundred Days offensive which would eventually force Germany to sue for piece.