Modern global warfare required full mobilization at home. In preparing to support the war effort, the country drew on recent experience. The progressives’ passion for organization, expertise, efficiency, and moralistic control was harnessed to the effort of placing the economy on a wartime footing and rallying the American people behind the war. In the process, the government gained unprecedented control over American life. At the same time, the war effort also produced unforeseen economic and political opportunities.