1828
- Work begins July 4 on the Chesapeake & Ohio (C&O) Canal to connect Washington, D.C. to the Ohio River. President Adams turns the first spade of soil to start a race across the Alleghenies between the B&O Railroad and the C&O canal.
1830
- It was "not uncommon to pull 4,000 shad or 300,000 herring in one seine haul... [or] 450 rockfish with an average weight of sixty pounds. . . . Hundreds of sturgeon . . . on a single night [on the Potomac] near the US Arsenal in Washington."
1833
- The silt from land runoff threatens navigation of the Potomac River.
1840
- The oyster canning industry begins in Baltimore.
1845
- The United States Naval Academy opens in Annapolis, Maryland.
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