| Date |
Event |
President |
Effect |
| 1803 | Louisiana Purchase | Jefferson | Manifest Destiny |
| 1818 | Abolished International Slave Trade | Jefferson | (blank) |
| 1814 | No longer believed U.S. Indians would benefit from U.S. expansion | Madison | (blank) |
| 1819 | Adams-Onis Treaty cedes Florida from Spain | Monroe | (blank) |
| 1819 | Missouri applied for admission | Monroe | (blank) |
| 1820 | Missouri Compromise | Monroe | Missouri/Maine |
| 1820 | Boom period until 1830's | Monroe | (blank) |
| 1820 | National unity deteriorates until 1850 | Monroe | (blank) |
| 1821 | People started moving to Texas | Monroe | (blank) |
| 1824 | Increase in tariffs (1) | Monroe | (blank) |
| 1828 | Increase in tariffs (2) | Adams | 'tariff of abominations'- Calhoun |
| 1830 | Indian Removal Act | Jackson | (blank) |
| 1832 | Increase in tariffs (3) | Jackson | 'null and void'- South Carolina |
| 1833 | Threatened invasion of South Carolina | Jackson | (blank) |
| 1835 | Excess of money. Result of 'Boom' Period | Jackson | (blank) |
| 1835 | Texans push for independence | Jackson | (blank) |
| 1836 | Depression until 1840's | Jackson | (blank) |
| 1836 | Whig party formed | Jackson | (blank) |
| 1836 | Texan war | Jackson | Santa Anna invades Texas and is defeated |
| 1840 | Expansion was enthusiastic | Van Buren (Whig) | (blank) |
| 1845 | 'Reannexation of Texas, reoccupation of Oregon' | Polk | (blank) |
| 1845 | Manifest Destiny | Polk | (blank) |
| 1845 | Sent Slidell to negotiate with Mexico about California and New Mexico | Polk | (blank) |
| 1846 | 54'40' or fight. Or not. - Oregon Treaty | Polk | (blank) |
| 1846 | Wilmot Proviso | Polk | (blank) |
| 1846 | Mexican War begins | Polk | (blank) |
| 1848 | Treaty of Guadalupe-Hidalgo (Trist) | Polk | (blank) |
| 1849 | California Gold Rush | Taylor | (blank) |
| 1850 | California a state | Taylor | (blank) |
| 1850 | Oregon a territory | Taylor | (blank) |
| 1850 | Deseret a future state | Taylor | (blank) |
| 1850 | 1850 Comprimise | Taylor | (blank) |
| 1850 | The Georgia Platform | Fillmore | (blank) |
| 1852 | Uncle Tom's Cabin | Pierce | (blank) |
| 1853 | Gadsden Purchase | Pierce | (blank) |
| 1853 | Kansas-Nebraska Act | Pierce | (blank) |
| 1854 | Bleeding Kansas | Pierce | Stephen Douglas |
| 1854 | Wants to annex Cuba twice | Pierce | (blank) |
| 1856 | John Brown's first raid- killing 5 | Buchanon | (blank) |
| 1857 | Dred Scott Case | Buchanon | (blank) |
