William Clark By jcastellanos Aug 1, 1770 William Clark was born Period: Aug 1, 1770 to Sep 1, 1838 William Clark's Life Aug 1, 1784 William Clark moved to Louisville, Kentucky dates not exact Nov 15, 1789 Joined the militia date not exact Nov 15, 1792 Joined the Army and became an officer date not exact Sep 18, 1796 retired to manage family plantation date not exact Apr 24, 1803 Lewis asked Clark to join him on the expedition date not exact Aug 26, 1813 Became Governor of Missouri Territory date not exact Sep 1, 1838 Clark passed away