Overview
The United States evolved from an isolationist nation to the world's most powerful country, with over 800 military bases and 37% of global military spending. This transformation occurred through territorial expansion, world wars, and the creation of international institutions that remain central to global politics today.
Early American Expansion and Isolationism
- First 70 years: US expanded westward to Pacific Ocean through conquest of indigenous peoples
- Post-Civil War debate: Leaders like Secretary of State Seward pushed global expansion; Congress resisted
- Seward's successes and failures: Purchased Alaska from Russia; blocked from buying Greenland, Iceland, or Caribbean territory
- Anti-imperialist opposition: Many Americans feared entanglement in global politics and integration of "inferior" races
- Congressional checks limited expansionist ambitions during this period
Industrial Revolution and the Shift to Imperialism
- Late 1800s economic growth created larger economy requiring centralized federal bureaucracy
- Federal power concentration enabled expansionist presidents like William McKinley to act unilaterally
- 1898 Spanish-American War: McKinley dragged country into war over Cuba despite opposition
- Rising US easily defeated declining Spanish empire, marking turning point in global influence
Territorial Acquisitions (1898-1917)
| Year | Territory | Method |
|---|
| 1898 | Puerto Rico, Guam, Philippines | Spanish-American War victory |
| 1898 | Kingdom of Hawaii | Annexation |
| 1899 | Wake Island | Annexation |
| 1900 | American Samoa | Annexation |
| 1903 | Panama Canal Zone | Control established |
| 1916 | Dominican Republic | Military occupation |
| 1917 | American Virgin Islands | Purchase |
- Rapid acquisition of far-flung territories established US as truly global power
- US began protecting commercial and military interests abroad through pro-American regimes
- American influence extended to Nicaragua and Western diplomatic efforts regarding China
World War I and International Ambitions
- American intervention proved decisive factor in ending WWI
- President Wilson attended Paris Peace Conference and attempted to shape peace terms
- League of Nations: Wilson's ambitious international organization designed to promote global peace and cooperation
- Congressional isolationism blocked US membership, dooming Wilson's project
- During Great Depression and Hitler's rise, US focused more on regional than European affairs
World War II Transformation
- Pearl Harbor attack brought US into WWII after Japanese empire threatened American possessions
- US emerged as only major power avoiding economic ruin during war
- Sole possessor of atomic weapons gave US unique position to set peace terms
- War permanently transformed America's global presence and commitments
Post-War Institutional Framework
- United Nations: Charter established international law prohibiting wars of conquest like Nazi and Japanese campaigns
- UN provided forum for international community to address and resolve disputes peacefully
- Bretton Woods Agreement (1944): 730 delegates from 44 Allied nations met in New Hampshire
- Goal: Establish global financial system preventing another Great Depression and world war
- Created World Bank and International Monetary Fund as backbone of global financial system
Cold War and Containment Strategy
- Soviet Union as second superpower created ideological conflict with democratic West
- US viewed Soviet expansion in Eastern Europe as threat to free-trading world vision
- NATO creation: Military alliance designed to prevent Russian invasion of European countries
- Containment strategy: US committed to containing spread of Communism everywhere globally
- Massive WWII military machine continued operating instead of disbanding
Cold War Global Interventions
- Unlikely alliances formed with Saudi Arabia, Israel, South Korea as bulwarks against communism
- Secret interventions in dozens of countries to contain Soviet influence
- Iran: Propping up sympathetic dictators
- Afghanistan (1979) and Nicaragua (1985): Supplying rebels with arms and money
- Hundreds of interventions created complicated web of alliances, tensions, relationships worldwide
Post-Cold War System Maintenance
- After Berlin Wall fell (1991), US could have withdrawn but chose continued engagement
- Presidents Bush and Clinton decided US should continue managing global affairs as sole superpower
- NATO expanded despite end of Soviet threat to keep European nations united
- Support for Israel and Japan continued as means of preventing regional wars
- Cold War alliance system and military commitments became permanent features
Contemporary Challenges to the System
- No major American politician seriously called for dismantling system until Donald Trump
- Trump questioned whether allies pay enough for US protection and value of free trade
- Suggested Japan, South Korea, Saudi Arabia should protect themselves independently
- Trump's positions represent sharp divergence from 1945 consensus toward pre-WWII isolationism
- Future of decades-long institution building and alliances remains uncertain under changing political leadership