The Ohio River: A Natural Waterway, Not "Added" to the U.S.

The Ohio River is a naturally occurring river—not a man-made canal or political acquisition "added" to the United States. It flows 981 miles (1,579 km) from Pittsburgh, PA (confluence of Allegheny & Monongahela) to Cairo, IL, where it joins the Mississippi.

Historical Context:

• Pre-colonial: Major travel/trade route for Indigenous nations (Shawnee, Miami, Lenape, Cherokee, etc.).
• 1763: Treaty of Paris—Britain gains control east of Mississippi.
• 1783: Treaty of Paris—U.S. gains territory northwest of Ohio River.
• 1787: Northwest Ordinance—Ohio River as boundary for new states (OH, IN, IL, KY, WV).
• 19th c.: Steamboat commerce, settlement, Underground Railroad crossing.

The river became a U.S. boundary and transportation artery through treaties and settlement—but the river itself was never "added." It's a geographic feature that shaped history.