The Sixty-Sixth Congress of the United States convened from March 4, 1919, to March 4, 1921. It was composed of the Senate and the House of Representatives, with the Democrats holding a majority in both chambers. This Congress was notable for addressing issues related to the aftermath of World War I and the beginning of the Roaring Twenties. During its sessions, the Sixty-Sixth Congress passed significant legislation, including the Volstead Act, which enforced Prohibition. Additionally, it dealt with the ratification of the Treaty of Versailles, which aimed to establish peace after the war and included the creation of the League of Nations.