How did the united states find enough soldiers for its participation in world war i?

The United States primary contribution to the Allied war effort in the First World War was sending troops to France to fight the Germans. The US supplied most of the transport & merchant shipping to move the troops. The US also supplied escort ships for these convoys. The US also supplied food, ammunition, and other supplies to the Allies. Although the US Navy sent ships to operate with the British Royal Navy, there were very few that engaged in combat. There was very extensive ground combat for American Army & the few Marine troop sent to France. They used both American, British & French equipment. American pilots were trained in France to fly French-made aircraft (some British-made aircraft were also used). No American made aircraft were used in the war in Europe.