Learn how the Selective Service Act changed the way we fought "the war to end all wars" in this clip from The Draft. World War I required a mass mobilization of troops, and it ushered in the era of the draft board and benefits for veterans. By the time America was drawn into World War II, the American people were proud to fight for their ideals—and did so in record numbers, responding to a decade of economic turmoil with new enthusiasm for a common cause.