The First World War actually reinforced the classic American aversion to involvement in European affairs, as evidenced by the Senate's rejection of the Treaty of Versailles. Throughout the 1920s the majority of Americans supported a policy that could best be described as isolationist. The seeming futility of the war left many young Americans "the Lost Generation" rejecting traditional authority. The war also accelerated the woman's suffrage movement, as suffragists like Alice Paul were quick to exploit democratic rhetoric to push for the right to vote. Women's roles in industry and in the home during the war gave added impetus to these demands, and the Nineteenth Amendment was passed in 1920, just after the war. The war also led to the suppression of "unamerican" anti-war sentiments at home, with the Espionage and Sedition Acts being upheld by the Supreme Court. The anti-communist hysteria of the Red Scare can be traced to the anti-union, anti-European rhetoric of the war era.