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1830	The Book of Mormon published.
1836	Battle of the Alamo. Texas declares independence from Mexico.
1837	Steel plow patented.
1840s	Practical mechanical reapers created. Fourierist communities founded.
1841	First wagon trains head west on Oregon Trail. Vice President John Tyler becomes president when William Henry Harrison dies.
1844	James K. Polk elected president. Samuel F. B. Morse demonstrates telegraph.
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	Mormons settle in Utah.
1848	Treaty of Guadalupe Hidalgo. Oneida community organized. Seneca Falls convention.
1849	California gold rush begins.
1850	Utah Territory annexed. Railroads granted six square miles of land for every mile of track.
1851	Fort Laramie conference marks the beginning of Indian concentration.
1855	Massachusetts integrates public schools.
1857	Mormon War.
1861	California connected to nation by telegraph.