1889 Jane Addams opens Hull House.
1896 Plessy v. Ferguson.
1900 Socialist Party founded.
1901 William McKinley assassinated; Theodore Roosevelt becomes president.
1902 Antitrust lawsuit filed against Northern Securities Company.
Roosevelt mediates anthracite coal strike.
1903 Women's Trade Union League (WTUL) founded.
Panama Canal construction begins.
1904 Roosevelt Corollary to Monroe Doctrine.
1905 Industrial Workers of the World (IWW) founded.
1906 Pure Food and Drug Act and Meat Inspection Act.
Atlanta race riot.
Hepburn Act.
1907 Panic on Wall Street.
"Gentlemen's Agreement" with Japan.
1908 Muller v. Oregon.
William Howard Taft elected president.
1909 Garment workers' strike.
National Association for the Advancement of Colored People (NAACP) formed.
1911 Triangle fire.
1912 Roosevelt runs for president on Progressive Party ticket.
Woodrow Wilson elected president.
1913 Suffragists march in Washington, D.C.
Federal Reserve Act.
1914 Federal Trade Commission (FTC) created.
Clayton Antitrust Act.
1916 Margaret Sanger opens first U.S. birth control clinic.