How the 1917 Selective Service Act Readied America for WWI

The Act transformed U.S. mobilization through six mechanisms:

1. National Army Creation: Drafted men 21–30 (later 18–45).
2. Massive Manpower: 2.8M drafted; 4M+ total in uniform by 1918.
3. Standardized Training/Equipment: Cohesive, uniform force.
4. Morale Boost: Visible national commitment.
5. Efficient Resource Allocation: Manpower directed to critical needs.
6. Planning & Logistics: Predictable troop flows.

The draft was the backbone of American Expeditionary Forces' deployment.