U.S. troops occupy Vera Cruz during the Mexican Revolution.
Federal Trade Commission Act.
Wilson protests British interception of U.S. merchant ships
National guardsmen fire on a tent colony of striking miners and their families in Ludlow, Colorado; approximately twenty men, women, and children are killed by bullets and the ensuing fire set by the guardsmen (April 20).
Socialist leader Eugene V. Debs receives a ten-year sentence for his opposition to the war.
Panama Canal is completed.
Clayton Antitrust Act exempts organized labor from antitrust legislation.
President Wilson proclaims American neutrality in World War I.
Great War erupts in Europe after Archduke Franz Ferdinand is assassinated in Sarajevo (August).