The Western Frontier By bakus522 Jul 1, 1787 Northwest Ordinance is legislated All land west of the Mississippi River is the Frontier Mar 1, 1803 Ohio Admitted Into Statehood May 1, 1804 Corps of Discovery Expedition begins Dec 11, 1816 Indiana Admitted Into Statehood Dec 3, 1818 Illinois Admitted Into Statehood Jan 26, 1837 Michigan Admitted Into Statehood Jan 1, 1848 Gold is Discovered in California May 29, 1848 Wisconsin Admitted Into Statehood Sep 21, 1866 Buffalo Soldiers are established May 10, 1869 Transcontinental Railroad is completed