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from The American Heritage® Dictionary of the English Language, 4th Edition

  • A river formed by the confluence of the Allegheny and Monongahela rivers in western Pennsylvania and flowing about 1,578 km (981 mi) to the Mississippi River at Cairo in southern Illinois. Control of the river was contested by the British and French until 1763. The region was ceded to the United States at the end of the Revolutionary War (1783).


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