| 1. The New West (1865–1914) |
7. The Roaring Twenties (1919–1929) |
| 2. Industrial Growth (1865–1914) |
8. The Great Depression (1929–1941) |
| 3. A New Urban Culture (1865–1914) |
9. The World War II Era (1935–1945) |
| 4. The Progressive Era (1876–1920) |
10. The Cold War Era (1945–1991) |
| 5. Becoming a World Power (1865–1916) |
11. Prosperity, Rebellion, and Reform (1945–1980) |
| 6. World War I (1914–1919) |
12. The Nation in a New World (1970–Present) |