1. 1821: Washington County was established as the first county in Missouri. 2. 1839: The first courthouse in Washington County was built in Potosi. 3. 1845: The first school in Washington County was established in Potosi. 4. 1859: The first railroad in Washington County was built, connecting Potosi to St. Louis. 5. 1861: Washington County was the site of the Battle of Fredericktown, a Civil War...
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