Precolumbian Era

Era Menu Precolumbian Era: 1 Billion BC - 1500 AD Exploration: 1500 - 1854 Kansas Territory: 1858 - 1861 Douglas County Infancy: 1862 - 1874 Closing the Frontier: 1875 - 1881 Building Douglas County: 1882 - 1899 Agriculture and Ranching: 1900 - 1918 Boom and Bust: 1920 - 1939 Small Town USA: 1940 - 1959 Destruction and Recovery: 1960 - 1979 Growth and Prosperity: 1980 - 2000   Location Menu All Castle Rock Franktown Highlands Ranch and Lone Tree Larkspur Louviers Mountains Parker Roxborough Sedalia Spring Valley, Cherry Valley & Greenland