Final answer:
The Selective Service Act of 1917 required all men between the ages of 21 and 30 to register for the draft in order to meet the military needs during World War I.
Step-by-step explanation:
The Selective Service Act of 1917 required all men between the ages of 21 and 30 to register for the draft. This act gave the government the power to conscript men into the military during times of war. It was a response to the needs of World War I and aimed to ensure that enough men were available for military service.
Learn more about Selective Service Act of 1917