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Progressive Era
| 1890s | 1898 | Maine explosion in Havana harbor |
| Spanish-American War | ||
| Dewey's victory at Manila Bay | ||
| Teller Amendment | ||
| Hawaii annexed. | ||
| New York City consolidates five boroughs into Greater New York. | ||
| Charlotte Perkins Gilman, "Women and Economics". | ||
| 1898-1902 | United States suppresses guerrilla uprising in Philippines. | |
| 1899 | Senate ratifies treaty acquiring the Philippines. | |
| Aguinaldo launches rebellion against United States in the Philippine Islands. | ||
| First United States Open Door notes on China. | ||
| United States helps put down Boxer uprising. | ||
| Scott Joplin, "Maple Leaf Rag." | ||
| Kate Chopin, "The Awakening". | ||
| Thorstein Veblen, "The Theory of the Leisure Class". | ||
| Theodore Dreiser, "Sister Carrie". | ||
| 1900s | 1900 | Currency Act officially places United States on gold standard. |
| Hawaii receives full territorial status. | ||
| Boxer Rebellion and U.S. expedition to China. | ||
| Second Open Door notes on China. | ||
| McKinley reelected. | ||
| International Ladies' Garment Workers' Union (ILGWU) founded. | ||
| Socialist Party of America organized. | ||
| Carrie Chapman Catt becomes president of the National American Woman Suffrage Association (NAWSA). | ||
| 1901 | J. Pierpont Morgan organizes United States Steel. | |
| Supreme Court Insular Cases. | ||
| Assassination of McKinley; Theodore Roosevelt becomes president. | ||
| Filipino rebellion defeated | ||
| Hay-Pauncefote Treaty | ||
| Commission system established in Galveston, Texas | ||
| Progressive Robert La Follette elected governor of Wisconsin. | ||
| Platt Amendment retains U.S. role in Cuba. | ||
| 1902 | U.S. troops leave Cuba. | |
| Colombian Senate rejects canal treaty | ||
| Anthracite coal strike; Roosevelt mediates coal strike. | ||
| Newlands Act | ||
| Philippines Government Act. | ||
| National Reclamation Act. | ||
| Owen Wister, "The Virginian". | ||
| Jane Addams, "Democracy and Social Ethics". | ||
| 1903 | Hay-Herran Treaty rejected by Colombia. | |
| "Revolution" in Panama organized by Philippe Bunau-Varilla. | ||
| Department of Commerce and Labor established. | ||
| Elkins Act | ||
| Wright brothers fly the first airplane. | ||
| First story-sequence motion picture. | ||
| Hay-Bunau-Varilla treaty | ||
| W. E. B. Du Bois, "The Souls of Black Folk". | ||
| 1904 | Roosevelt declares his corollary to the Monroe Doctrine. | |
| Northern Securities case | ||
| Roosevelt defeats Alton B. Parker for presidency | ||
| Lincoln Steffens, "The Shame of the Cities". | ||
| Ida Tarbell, "History of the Standard Oil Company". | ||
| 1904-1914 | Construction of the Panama Canal | |
| 1905 | United States takes over Dominican Republic customs. | |
| Roosevelt mediates Russo-Japanese peace treaty. | ||
| Lochner v. New York | ||
| Industrial Workers of the World (IWW) organized. | ||
| Niagara Movement established by W. E. B. Du Bois and others. | ||
| Gifford Pinchot appointed head of U.S. Forest Service. | ||
| 1906 | San Francisco Japanese education crisis; At the request of Roosevelt, San Francisco ends segregation of Asian schoolchildren. | |
| Roosevelt arranges Algeciras conference | ||
| Hepburn Act | ||
| Meat Inspection Act | ||
| Pure Food and Drug Act | ||
| Antiquities Act | ||
| Upton Sinclair, "The Jungle". | ||
| 1906-1909 | U.S. Marines occupy Cuba. | |
| 1907 | Oklahoma admitted to the Union | |
| Roosevelt sends the "Great White Fleet" around the world. | ||
| Walter Rauschenbusch, "Christianity and the Social Crisis". | ||
| William James, "Pragmatism". | ||
| 1907-1908 | "Gentlemen's Agreement" with Japan | |
| 1908 | Root-Takahira agreement | |
| Muller v. Oregon | ||
| Taft defeats Bryan for presidency(William Howard Taft elected president) | ||
| Aldrich-Vreeland Act | ||
| 1909 | Payne-Aldrich Tariff | |
| Ballinger-Pinchot controversy. | ||
| National Association for the Advancement of Colored People (NAACP) founded. | ||
| Herbert Croly, "The Promise of American Life". | ||
| 1910s | 1910 | Mann-Elkins Act. |
| Jane Addams, "Twenty Years at Hull House". | ||
| 1911 | Triangle Shirtwaist Company fire. | |
| Standard Oil antitrust case(Supreme Court orders dissolution of Standard Oil Company.) | ||
| U.S. Steel Corporation antitrust suit. | ||
| 1912 | Wilson defeats Taft and Roosevelt for presidency. | |
| U.S. Marines occupy Nicaragua. | ||
| 1913 | Sixteenth Amendment (income tax) passed. | |
| Federal Reserve Act | ||
| Underwood Tariff Act | ||
| Seventeenth Amendment passed. (direct election of U.S. senators) | ||
| Huerta takes power in Mexico. | ||
| Thirty thousand march for woman suffrage in New York. | ||
| 1914 | Clayton Anti-Trust Act | |
| Federal Trade Commission established.(Federal Trade Commission Act) | ||
| U.S. occupation of Vera Cruz, Mexico. | ||
| World War I begins in Europe(Archduke Franz Ferdinand of Austria assassinated). | ||
| President Woodrow Wilson proclaims American neutrality. | ||
| Wilson protests British interception of U.S. merchant ships. | ||
| Completion of Panama Canal. | ||
| 1915 | La Follette Seamen's Act | |
| American marines sent to Haiti: U.S. Marines occupy Haiti and the Dominican Republic. | ||
| Council of National Defense established. | ||
| Woman's Peace party organized. | ||
| British liner Lusitania sunk by German U-boat. | ||
| Wilson's "strict accountability" note protests German U-boat attacks. | ||
| U.S. "preparedness" movement begins. | ||
| Germany restricts U-boat campaign. | ||
| Wilson permits U.S. bank loans to Allies. | ||
| Modern Ku Klux Klan founded. | ||
| 1916 | Sussex ultimatum and pledge. | |
| Workingmen's Compensation Act | ||
| Federal Farm Loan Act | ||
| Warehouse Act | ||
| Adamson Act | ||
| Pancho Villa raids New Mexico. | ||
| Brandeis appointed to Supreme Court. | ||
| Wilson defeats Hughes for presidency. | ||
| Keating-Owen Act | ||
| After Sussex sinking, Germany pledges not to attack merchant ships without warning. | ||
| Margaret Sanger opens nation's first birth control clinic in Brooklyn, New York. | ||
| National Park Service created. | ||
| John Dewey, "Democracy and Education". | ||
| 1917 | United States buys Virgin Islands from Denmark. | |
| Germany resumes unrestricted U-boat warfare; United States breaks diplomatic relations. | ||
| Zimmerman note | ||
| United States enters World War I. | ||
| Espionage Act of 1917 | ||
| Puerto Ricans granted U.S. citizenship. | ||
| U.S. troops withdraw from Mexico. | ||
| Selective Service Act sets up national draft. | ||
| War Industries Board, Committee on Public Information, and Food Administration created. | ||
| NAACP march in New York City protests antiblack riot in East St. Louis and upsurge in lynchings. | ||
| Bolsheviks seize power in Russia; Russia leaves the war. | ||
| New York State passes woman-suffrage referendum. | ||
| U.S. government seizes the nation's railroads. | ||
| 1918 | Wilson proposes the Fourteen Points. | |
| Sedition Amendment to Espionage Act. | ||
| Battle of Ch液eau-Thierry; Second Battle of the Marne | ||
| Meuse-Argonne offensive | ||
| American Expeditionary Force (AEF) helps stop Germans at Ch液eau-Thierry and Belleau | ||
| Armistice signed (November 11). | ||
| 1919 | Paris Peace Conference and Treaty of Versailles. | |
| Wilson's pro-League tour and collapse. | ||
| Seattle general strike. | ||
| American Legion founded. | ||
| Eighteenth Amendment added to the Constitution.(Volstead Act.) | ||
| Racial violence in Chicago. | ||
| Wilson suffers paralyzing stroke. | ||
| Versailles treaty, with League covenant, rejected by Senate. | ||
| Sherwood Anderson, "Winesburg, Ohio". | ||
| 1919-1920 | "Red scare" |