Diplomacy and International Relations
From expansion to world power
The diplomacy domain rewards a clear sequence. Early guidance included Washington's Farewell Address (avoid entangling alliances) and the Monroe Doctrine (1823), warning Europe against new colonization in the Americas. The 1890s brought overseas expansion: the Spanish-American War (1898) produced Puerto Rico, Guam, and the Philippines; the Open Door notes sought equal trade access to China; the Roosevelt Corollary asserted U.S. police power in the Caribbean. World War I began with neutrality, shifted to intervention in 1917, and ended with the Fourteen Points-but the Senate rejected the Versailles Treaty and League of Nations.
Isolationism, Cold War, and after
In the 1930s neutrality laws reflected isolationism, but Lend-Lease and Pearl Harbor (1941) brought entry into World War II. The Cold War produced containment: Truman Doctrine (1947), Marshall Plan (1948), NATO (1949), and interventions in Korea and Vietnam. Détente in the 1970s eased tensions before renewed confrontation and then the Soviet collapse. Post-Cold War policy addressed terrorism, the Middle East, and trade.
Traps and a rule of thumb
Questions confuse the Truman Doctrine (aid to Greece and Turkey to resist communism) with the Marshall Plan (economic reconstruction of Western Europe). Remember that the Senate must ratify treaties, which explains the League failure. Do not label pre-1898 policy as consistently isolationist-it was regional and commercial. Rule of thumb: name the instrument (aid, alliance, treaty, military force), then the doctrine.
Worked example: "Which policy provided economic aid to rebuild Western Europe after 1945?" That is the Marshall Plan; the Truman Doctrine was narrower security assistance.