did the United States draft 3 million men between the ages 21-30 to fight in the world war 1?

Answer 1

No. It was 2.8 million total out of a total of 24 million that had registered, and the age range depended on which wave of the draft you got caught up in. During World War I there were three registrations. The first, on June 5, 1917, was for all men between the ages of 21 and 31. The second, on June 5, 1918, registered those who attained age 21 after June 5, 1917. The third registration was held on September 12, 1918, for men age 18 through 45.

Answer 2

When the United states entered World War 1 the U.S. army was not very large, it only had about 130,000 men ready and this was tiny compared to the conscripted forces of the United Kingdom, France, Germany, and Austria-Hungary. When America declared war on April 2, 1917 it was clear that a rapid expansion of the military would be necessary to make a difference and this led to the passage of the Selective Service Act of 1917 to quickly mobilize as many young, male American's as possible to meaningfully contribute to the war effort.