U.S. Territorial Acquisitions Version en ligne Westward Expansion par Kathleen Bucher 1 Purchased from France in 1803 2 Original 13 states and territories after 1783 Treaty of Paris 3 This territory was ceded to the U.S, in 1848, following a war. 4 Annexed by the U.S. in 1845 5 Ceded by Britain in 1818 - called the Red River Cession 6 Gadsden Purchase 7 This territory became home to Mormons and prospectors looking for opportunities 8 Acquired in 1853 9 Acquired in 1819 from Spain