Maps: Land and environment. Land and water -- Climate -- History. Native americans -- Bison -- Exploring the great plains -- Military forts and trading posts -- Railroads -- The historic sterling, colorado, area -- Population. Population density -- Ethnicity and race -- Demographics -- Ancestry -- Rural settlement and agriculture. Homesteading and farms -- Livestock -- Crops -- Urban settlement and economy. Urban characteristics -- Employment -- Energy -- Politics and government. Selected U.S. presidential elections -- National legislative seats -- Recreation and services. Recreation -- Media and communications -- Sports -- Medical -- Artists, performers, and writers -- Social indicators. Education -- Crime -- Religion.