Westward Expansion By Casey Hughey Apr 30, 1804 Louisiana Purchase U.S. bought Louisiana from Frace for 15 million dollars. Jun 18, 1812 War of 1812 War of 1812 began. Mar 23, 1815 War of 1812 War of 1812 ended. Apr 25, 1846 Mexican-American War The Mexican-American War officially began. Feb 2, 1848 Mexican-American War Mexican-American War ended.
