Which war era led to the creation of the military draft and a large-scale mobilization in U.S. history?

• A. World War II
• B. World War I
• C. Vietnam War
• D. Korean War

Answer: (B)

The main idea here is how the United States first organized a nationwide draft and mobilized for a major war. In the World War I era, the need to quickly raise a large army led Congress to pass the Selective Service Act in 1917, creating a national draft system with men registering and being chosen by lottery, along with classifications and exemptions. This framework, paired with mass training camps, intensified production, and expanded transportation, allowed the U.S. to field a substantial force in Europe—the American Expeditionary Force—and to mobilize resources on a scale previously unseen.

While later conflicts also involved drafts and even larger mobilizations, the crucial development—the creation of a nationwide draft system and the apparatus to mobilize millions of Americans for war—began in World War I.