How many soldiers did the US have at the beginning of World War 1?

At the beginning of World War I in 1914, the United States had a relatively small standing army of about 100,000 soldiers. However, this number increased significantly after the U.S. entered the war in 1917, as the government implemented a draft and expanded military training programs to mobilize millions of troops. Ultimately, around 4.7 million Americans served in the military during the war.