The Progressive Movement came to an end in the mid to late 1910s. There were a few reasons for this. One reason was the start of World War I. Once World War I began and especially once we joined the war, our country had to focus on winning the war. This diverted attention away from dealing with the social issues at home. Winning the war took priority over resolving the social problems at home.
Once the war ended, there was little desire to deal with other social issues. Americans had been dealing with resolving issues, either at home or abroad, since the beginning of the century. Americans were tired of dealing with problems. They wanted to return to a normal life. When Warren Harding campaigned on a slogan of a “return to normalcy”, Americans strongly supported that idea.