Westward Expansion Time line By Isabelladixon Period: Jan 1, 1750 to Dec 31, 1860 west ward expasion Jan 1, 1793 Cotton gin invented Jan 1, 1797 XYZ affair starts Jan 1, 1798 XYZ affair ends Apr 30, 1803 Louisiana purchase was a land deal between the US and France Jan 1, 1818 Agreement of 49th parallel Feb 22, 1819 Adams onis treaty Dec 2, 1823 Monroe Doctrine Feb 23, 1836 begining of the Battle of the Alamo Mar 2, 1836 Texas clamis Independece Mar 6, 1836 the ending of the battle of the alamo Jan 1, 1838 Beging of trails of tears Jan 1, 1839 ending of the trail of tears Jan 1, 1845 Texas annexed to U.S starts Apr 25, 1846 Mexican American War starts Jun 15, 1846 California becomes a state Jan 1, 1848 Texas annexed to U.S ends Feb 2, 1848 Treaty of guadalupe hidalgo Feb 2, 1848 Mexican American war ends Dec 30, 1853 Gadsen purchase May 30, 1854 Kansas Nebraska Act