Washington By eme101396 Period: May 14, 1804 to Sep 23, 1806 The Lewis and Clark expedition 1853 Congress creates Washington territory 1855 Indian Wars 1883 Northern Pacific railroad links Washington and the East Nov 11, 1889 Washington became a state 1942 Grand Coulee dam is completed 1961 Columbia river treaty of 1961 Period: Apr 21, 1962 to Oct 21, 1962 World fair May 18, 1980 Mount St. Helen's errupts
