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|Centuries:||18th century - 19th century - 20th century|
|Decades:||1810s 1820s 1830s - 1840s - 1850s 1860s 1870s|
|Years:||1840 1841 1842 1843 1844 1845 1846 1847 1848 1849|
- February 2 - The Treaty of Guadalupe Hidalgo ends the Mexican-American War and cedes the land that later became California, Nevada, Utah, Colorado, Wyoming, and parts of Arizona and New Mexico to the United States.