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St. Clair County was originally part of the Northwest Territory, which was established by Congress in 1787. The original boundaries of St. Clair County included about two-thirds of the State of Illinois and it was the first county established in the State. Arthur St. Clair, Governor of the Northwest Territory organized the county in 1790. Parts of the county were portioned off to make new counties until it reached its present size in 1818.

The first European settlement on the Mississippi River was colonial Cahokia. Cahokia is over 300 years old and was founded in 1699, the same year as Williamsburg, Virginia. It was once larger than St. Louis and during the winter of 1803-04 Lewis and Clark used Cahokia as an administrative center as the prepared for their journey into the west.

After the Revolutionary War a large number of veterans took advantage of the one hundred acre land grants they received for their service in the war. These immigrants chose to settle, not in the bottomlands near Cahokia, but on the high ground inland from the Mississippi River. By 1814 these Americans wanted a more centrally located seat of government and the county seat was moved to Belleville.

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  This St. Clair County website page is for History, Facts, Archives, Records, Museums, Exhibits, Documents, Genealogy, Libraries, Historians, Timeline, Research, Historic Preservation, Ancestry and Statistics in St. Clair County, O'Fallon, Saint Libory, Alorton, Belleville, Brooklyn, Lovejoy, Cahokia, Caseyville, Centreville, Dupo, East Carondelet, East St. Louis, Fairview Heights, Fayetteville, Freeburg, Lebanon, Lenzburg, Marissa, Mascoutah, Millstadt, New Athens, Sauget, Shiloh, Smithton, St. Libory, Summerfield, Swansea, Washington Park, East St. Louis, Engelmann, Prairie du Long, Shiloh Valley, St. Clair, Stites, Stookey and Sugarloaf. Places of interest in St. Clair County include Cahokia Mounds, Saint Louis University, Lindenwood University, Southwestern Illinois College, McKendree College, MidAmerica St. Louis Airport, Air Mobility Command, United States Transportation Command, Eighteenth Air Force, Air Force Communications Agency, Greater St. Louis, National Stock Yards, Scott AFB, Scott Air Force Base, Peabody River King St. Fish and Wildlife Area, Church of the Holy Family, National Shrine of Our Lady of the Snow, GMC Stadium, Cahokia Courthouse, Frank Holten State Park, Gateway International Raceway, Bellefontaine House, Belleville Labor and Industry Museum, Broadway Center of Arts, Illinois Caverns State Natural Area, Jarrot Mansion, Emma Kunz House, Martin-Boismenue House, Peterstown House, Saint Peter's Cathedral, William and Florence Schmidt Art Center and the Victorian Home Museum.

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