The 20th century saw a diverse group of Presidents in the United States, each facing unique challenges. Notable figures include Franklin D. Roosevelt, who led the country during the Great Depression and World War II, and John F. Kennedy, known for his inspirational speeches and the Cuban Missile Crisis. Other significant Presidents include Harry S. Truman, who made the decision to use atomic bombs in WWII, and Ronald Reagan, who played a key role in ending the Cold War. Each President's policies and leadership styles have shaped modern America in various ways.