| Title | Terms | Created |
| The Great Depression (CH 26) | 30 | March 3, 2009 |
| The Roaring Twenties (CH 25) | 24 | February 10, 2009 |
| World War I (CH 24) | 33 | February 10, 2009 |
| Becoming a World Power (CH 23) | 23 | January 13, 2009 |
| The Progressive Era (CH 22) | 37 | November 16, 2008 |
| A New Urban Culture (CH 21) | 28 | November 16, 2008 |
| Industrial Growth (CH 20) | 28 | November 16, 2008 |
| The New West (CH 19) | 17 | October 29, 2008 |
| Reconstruction and the Changing South (CH 18) | 26 | October 9, 2008 |
| The Civil War (CH 17) | 27 | September 18, 2008 |
| The Nation in a New World (CH 30) | 33 | April 10, 2008 |
| Prosperity, Rebellion, and Reform (CH 29) | 17 | April 10, 2008 |
| Cold War Era (CH 28) | 38 | April 9, 2008 |
| World War II (CH 27) | 36 | March 8, 2008 |