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| 1892 | Sierra Club founded |
| 1895 | U.S. v. E.C. Knight |
| 1901 |
McKinley assassinated by Leon Czolgosz Teddy Roosevelt becomes president Hay-Paunceforte Treaty authorizes U.S. to build canal across the Isthmus |
| 1902 |
Northern Securities Company dissolved Platt Amendment passed |
| 1903 | Elkins Act passed |
| 1904 |
Lincoln Steffens writes The Shame of the Cities Roosevelt Corollary |
| 1905 | Treaty of Portsmouth settles Russo-Japanese War |
| 1906 |
Upton Sinclair writes The Jungle Pure Food and Drug Act passed |
| 1907 | Great White Fleet embarks on world tour |
| 1908 | Muller v. Oregon Taft elected president |
| 1909 | Payne-Aldrich Tariff |
| 1910 | Mann Act passed |
| 1911 |
Triangle Shirtwaist Fire Mexican Revolution erupts |
| 1912 |
Progressive Party nominates Teddy Roosevelt for presidency Wilson elected president in four-way race (vs. T.R., Taft, Debs) |
| 1913 |
16th (eliminating income tax) & 17th (direct election of senators) Amendments passed Underwood Tariff passed Federal Reserve Act passed |
| 1914 |
Clayton Antitrust Act passed Federal Trade Commission created U.S. Navy invades Veracruz Archduke Ferdinand assassinated World War I begins Panama Canal opens |
| 1915 |
Lusitania torpedoed Secretary of State Bryan resigns |
| 1916 |
Sussex Pledge Gen. Pershing pursues Pancho Villa in Mexico Margaret Sanger organizes New York Birth Control League Wilson re-elected president |
| 1917 |
Germany resumes unrestricted submarine warfare Zimmermann note intercepted Russian Revolution breaks out U.S. enters World War I Selective Service Act passed War Industries Board created |
| 1918 |
Wilson's 14 Points Sedition Act Armistice declared in World War I |
| 1919 |
Treaty of Versailles Schenck v. U.S. Senate rejects U.S. entry into League of Nations 18th Amendment outlaws buying, selling, transporting of liquor |
| 1920 |
19th Amendment ratified (giving women the franchise) Palmer raids Red Scare |
Feldmeth, Greg D. "U.S. History Resources"
http://home.earthlink.net/~gfeldmeth/USHistory.html (31 March 1998).
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