Big Stick Diplomacy – Theodore Roosevelt’s foreign policy of using military power (especially the navy) to influence international affairs.
Dollar Diplomacy – William Taft’s policy of promoting U.S. financial interests abroad, especially in Latin America, to gain influence.
Moral Diplomacy – Woodrow Wilson’s approach, emphasizing democracy and moral principles over economic or military intervention.
Boxer Rebellion – A violent uprising (1899-1901) in China against foreign influence; suppressed by an international coalition including U.S. troops.
Chinese Open Door Policy – U.S. policy to ensure all nations had equal trading rights in China, preventing colonial division.
Gentlemen’s Agreement – A 1907 U.S.-Japan agreement limiting Japanese immigration to the U.S. in exchange for fairer treatment of Japanese Americans.
Great White Fleet tour – Roosevelt’s show of U.S. naval power with a world tour (1907-1909) to assert dominance and influence.
Hawaiian Annexation – The U.S. took over Hawaii in 1898 after overthrowing its monarchy, largely for economic and strategic reasons.
Insular Cases – Supreme Court decisions ruling that full constitutional rights did not automatically extend to U.S. territories.
Jones Act – Granted U.S. citizenship to Puerto Ricans (1917) and promised eventual independence to the Philippines (1916).
Nicaragua--U.S. Marine Occupation – U.S. military intervention (1912-1933) to protect economic interests and maintain political stability.
Panama Canal – A key waterway (completed 1914) built by the U.S. to connect the Atlantic and Pacific Oceans for trade and military movement.
Platt Amendment – A U.S. policy restricting Cuban sovereignty after the Spanish-American War, allowing U.S. intervention in Cuban affairs.
Roosevelt Corollary – Roosevelt’s addition to the Monroe Doctrine, stating that the U.S. would intervene in Latin America to maintain stability.
Root-Takahira Treaty – A 1908 agreement between the U.S. and Japan recognizing each other’s Pacific territories and interests.
Secure Railroad Work in China – The U.S. sought access to railroad-building opportunities in China to extend economic influence.
Spanish-American War – A 1898 war where the U.S. defeated Spain, gaining control of the Philippines, Guam, and Puerto Rico.
Tampico Incident – A 1914 conflict between the U.S. and Mexico over the arrest of U.S. sailors, escalating tensions with Mexico.
Teller Amendment – A U.S. declaration stating it would not annex Cuba after the Spanish-American War.
Treaty of Paris (1898) – Ended the Spanish-American War, giving the U.S. control over former Spanish territories like Puerto Rico and the Philippines.
Treaty of Portsmouth – Ended the Russo-Japanese War (1905); mediated by Roosevelt, who won the Nobel Peace Prize for his efforts.
Child Labor Act – A 1916 law banning the sale of goods made by child labor; later overturned by the Supreme Court.
Clayton Antitrust Act – Strengthened antitrust laws, making monopolies and unethical business practices illegal.
Elkins Act – A 1903 law preventing railroad rebates to large businesses, ensuring fair rates.
Federal Farm Loan Act – Provided loans to farmers at low-interest rates.
Federal Reserve Board – Created in 1913 to regulate banks and control the money supply.
Federal Trade Commission (FTC) – A government agency to prevent unfair business practices and monopolies.
Hepburn Act – Allowed the Interstate Commerce Commission to regulate railroad rates.
Mann-Elkins Act – Strengthened government regulation of railroads and telecommunications.
Meat Inspection Act – A 1906 law requiring sanitary conditions in meatpacking plants, inspired by Upton Sinclair’s The Jungle.
Newlands Reclamation Act – Funded irrigation projects in arid western states.
Payne-Aldrich Act – A controversial tariff law (1909) that failed to lower tariffs significantly, angering Progressives.
Pure Food and Drug Act – A 1906 law requiring proper labeling of food and medicine and banning harmful substances.
Square Deal – Theodore Roosevelt’s domestic policy focusing on consumer protection, controlling corporations, and conservation.
16th Amendment – Allowed Congress to levy an income tax.
17th Amendment – Established direct election of U.S. senators.
18th Amendment – Prohibited alcohol (later repealed by the 21st Amendment).
19th Amendment – Granted women the right to vote.
Jane Addams – Founder of Hull House; advocate for social reform.
Carrie Chapman Catt – Women’s suffrage leader.
Eugene V. Debs – Socialist leader and labor organizer.
John Dewey – Progressive educator and philosopher.
Theodore Dreiser – Author who exposed social injustices.
W.E.B. Du Bois – Civil rights leader and co-founder of the NAACP.
Charles Evans Hughes – Progressive reformer and Supreme Court justice.
Hiram Johnson – Progressive California governor.
Florence Kelley – Advocate for child labor laws.
Robert La Follette – Progressive senator from Wisconsin.
Henry Demarest Lloyd – Journalist exposing corporate corruption.
John Muir – Environmentalist and founder of the Sierra Club.
Alice Paul – Suffragist and equal rights advocate.
Frances Perkins – First female cabinet member; labor activist.
Gifford Pinchot – First chief of the U.S. Forest Service.
Jacob Riis – Photographer documenting urban poverty.
Upton Sinclair – Author of The Jungle.
Ida Tarbell – Muckraker exposing Standard Oil.
Margaret Sanger – Birth control advocate.
Lincoln Steffens – Journalist exposing government corruption.
Frederick W. Taylor – Developed scientific management to improve efficiency.
Booker T. Washington – Civil rights leader advocating economic progress.
Allied Powers – U.S., Britain, France, Russia, Italy.
Central Powers – Germany, Austria-Hungary, Ottoman Empire.
Lusitania – British ship sunk by Germany, killing 128 Americans.
Zimmerman Telegram – German message urging Mexico to attack the U.S.
Fourteen Points – Wilson’s peace plan, including the League of Nations.
League of Nations – International peacekeeping organization (U.S. didn’t join).
Espionage & Sedition Acts – Laws suppressing anti-war speech.
Great Migration – Movement of African Americans to northern cities.
Red Scare – Fear of communism in the U.S.
Scopes Trial – 1925 trial over teaching evolution.
Black Tuesday – 1929 stock market crash.
New Deal – FDR’s programs to combat the Depression.
Dust Bowl – Severe drought worsening the Depression.
Social Security Act – Created a safety net for the elderly and unemployed.