1. 1818: The Missouri Territory was established, with Warren County being one of the original five counties. 2. 1820: The first courthouse in Warren County was built in Warrenton. 3. 1821: The first post office in Warren County was established in Warrenton. 4. 1825: The first school in Warren County was established in Warrenton. 5. 1836: The first newspaper in Warren County, The Warrenton Gazet...
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