Monroe Doctrine (1823)
U.S. policy warning European nations not to colonize or interfere in the Western Hemisphere
Seward’s Folly (1867)
U.S. purchase of Alaska from Russia; critics thought it was a waste of money.
Queen Liliuokalani
Last queen of Hawaii; overthrown by American sugar planters in 1893.
Alfred Thayer Mahan – Sea Power
Argued that a strong navy was key to national greatness.
“White Man’s Burden”
Idea that white nations had a duty to “civilize” non-Western peoples.
Pan-American Conference (1889)
Meeting of Western Hemisphere nations to promote trade and cooperation led by the U.S.
Jingoism
Extreme nationalism supporting aggressive foreign policy.
“Yellow Journalism”
Sensationalized news reporting that exaggerated stories (used before Spanish-American War).
De Lôme Letter
Letter from Spanish minister criticizing President McKinley; increased anti-Spain anger in U.S.
USS Maine
U.S. battleship that exploded in Havana Harbor (1898), helping trigger war with Spain.
Teller Amendment
U.S. promised not to annex Cuba after the Spanish-American War.
Platt Amendment
Allowed U.S. to intervene in Cuba and lease Guantanamo Bay.
Treaty of Paris (1898)
Ended Spanish-American War; U.S. gained Philippines, Puerto Rico, and Guam.
Emilio Aguinaldo
Filipino leader who fought U.S. after Spain left Philippines.
Insular Cases (1901)
Supreme Court cases ruling that constitutional rights did not fully apply in new territories.
Spheres of Influence
Areas where foreign nations controlled trade and investment (especially in China).
Boxer Rebellion (1900)
Chinese uprising against foreign influence; crushed by international forces.
TR’s “Big Stick” Policy
Theodore Roosevelt’s policy of negotiating peacefully but using military strength when necessary.
Roosevelt Corollary (1904)
Added to Monroe Doctrine; U.S. could intervene in Latin America to maintain stability.
Anti-Imperialist League
Group opposing U.S. expansion overseas.
Open Door Policy
U.S. policy promoting equal trade access in China.
Panama Canal (1914)
Canal built by U.S. connecting Atlantic and Pacific Oceans.
Russo-Japanese War (1904–1905)
War between Russia and Japan; Roosevelt helped negotiate peace.
“Gentlemen’s Agreement” (1907)
Japan limited emigration; U.S. reduced segregation of Japanese students.