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XI. World War I

WWI made the U.S. more isolationist and made it a world power
League of Nations - mediated international disputes
"Big 4" - Wilson (U.S.), Clemenceau (France), Lloyd George (Britain), Orlando (Spain)
U.S. never ratified the Treaty of Versailles
  Democrats modified treaty and would not vote for original
  Republicans would not vote for modified treaty
1919 - Wilson had a stroke, incapacited for rest of his term
1919 - Chicago race riots
1919-1920 - Brief economic recession
1920 - Red Scare
  Caused by formation of Comintern, mail bombs
  1920 - Palmer raids
  1920 - Sacco and Vanzetti trial
1929 - German economy collapsed
  Germany defaulted on reparation payments to France and Britain
  France and Britain defaulted on debts to U.S.