Fort McIntosh, in present-day Beaver, Pennsylvania, was built in 1778 near the junction of the Ohio and Beaver rivers as the first American fort north of the Ohio River and a key Revolutionary frontier post. Constructed under Lt. Col. Cambray-Digny and named for General Lachlan McIntosh, it supported agreements made with the Delaware and later housed the First American Regiment. In 1785 it became the site of the Treaty of Fort McIntosh, which forced major land cessions and set the first Northwest boundary used for later territories. Abandoned in 1791, the fort was rediscovered through excavations beginning in 1974 that uncovered structural remains and 80,000 artifacts.

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Vanport, Pennsylvania · USA