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The Ohio River was there long before the US. If you mean when did the US take control of the area then it was in 1783 after the Revolutionary War.

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Q: When was the Ohio River added to the US?
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What us river is called the gateway to west?

The Ohio River.


Is the Ohio river to the east of the us?

The river is IN the U.S. It is the southern border of Ohio and is later connected to the Mississippi River. = D


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When was the state of Ohio added to the US?

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