Oregon Country By Funch Period: Jan 1, 1800 to Dec 31, 1850 Manifest Destiny Mar 11, 1808 John Astor created the American Fur Company Mar 11, 1818 Britain and the U.S. create a joint occupation for Oregon Apr 15, 1819 Adams-Onis Treaty Adams-Onis Treaty was signed Mar 11, 1824 Russia gives up claim to the land south of Alaska Mar 11, 1825 John Quincy Adams becomes president Mar 11, 1830 Americans start traveling to the Oregon Country Jun 14, 1836 Marcus Whitman builds mission in Oregon Mar 11, 1840 "Oregon fever" sweeps through Mississippi valley Mar 11, 1846 U.S. and Britain set the Oregon Boundary at 49*N Nov 11, 1847 The Cayuse attack Dr.Macus's mission and killed him, his wife, and 11 others