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| 1822 | Mexico wins independence from Spain |
| 1836 | Texas declares independence from Mexico |
| 1842 | Migration to Oregon begins |
| 1844 | Polk elected president Anti-Catholic rioting in Philadelphia |
| 1845 | Texas annexed to U.S. as slave state |
| 1846 | Oregon Treaty U.S. declares war on Mexico Wilmot Proviso introduced in Congress |
| 1847 | Refugees from Irish potato famine arrive in large numbers to U.S. |
| 1848 | Treaty of Guadulupe Hidalgo settles Mexican-American War Gold discovered in California |
| 1849 | Cholera epidemic erupts in Eastern cities |
Feldmeth, Greg D. "U.S. History Resources"
http://home.earthlink.net/~gfeldmeth/USHistory.html (31 March 1998).
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