How did the selective service act prepare the united states for war?

The act authorized a draft of young men to build the size of the army .

The Selective Service Act can also be known as the "draft" - in essence, it forced men between the ages of 18-25 to join the armed forces. It helped prepare the US for war by allowing them to have a large reserve of forces.

they bring people together to achieve control of the government

basically choosinng what sets in   congress and presdicny this is to keepthe antion hole and so it can last because wiht out authority it wouldnt last a week