After radicals sent dozens of bombs to prominent government officials and American business men, Attorney General A. Mitchell Palmer initiated an anti-Red campaign. Appointing J. Edgar Hoover to the Justice Department, Palmer ordered a series of raids on suspected radical individuals and organizations. The raids turned up little evidence of violent intentions, but hundreds of aliens were deported anyway as a result.
Democratic Party nominee Woodrow Wilson won the presidential election, beating out three other candidates: Republican incumbent William Howard Taft, Progressive Party nominee Theodore Roosevelt, and Socialist Party nominee Eugene V. Debs.
Having refused to join the League of Nations and ratify the Treaty of Versailles, the United States ratified separate peace treaties with Germany, Austria, and Hungary to officially end its involvement in World War I.