| 1830 |
- The Book of Mormon published.
|
| 1836 |
- Battle of the Alamo.
- Texas declares independence from Mexico.
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| 1837 |
|
| 1840s |
- Practical mechanical reapers created.
- Fourierist communities founded.
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| 1841 |
- First wagon trains head west on Oregon Trail.
- Vice President John Tyler becomes president when William Henry Harrison dies.
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| 1844 |
- James K. Polk elected president.
- Samuel F. B. Morse demonstrates telegraph.
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| 1845 |
- Term manifest destiny coined.
- Texas enters Union as slave state.
- Potato blight spurs Irish immigration.
|
| 1846 |
- Bear Flag Revolt.
- Congress declares war on Mexico.
- United States and Great Britain divide Oregon Country.
|
| 1847 |
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| 1848 |
- Treaty of Guadalupe Hidalgo.
- Oneida community organized.
- Seneca Falls convention.
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| 1849 |
- California gold rush begins.
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| 1850 |
- Utah Territory annexed.
- Railroads granted six square miles of land for every mile of track.
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| 1851 |
- Fort Laramie conference marks the beginning of Indian concentration.
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| 1855 |
- Massachusetts integrates public schools.
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| 1857 |
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| 1861 |
- California connected to nation by telegraph.
|