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Ohio RiverNONE（无词性）- 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).俄亥俄河：由宾夕法尼亚州西部的阿勒格尼河和莫农加希拉河汇流合成的河，流程1,578公里(981英里）之后在伊利诺斯州的开罗汇入密西西比河。在1763年以前，英法争相控制这条河。这一地区在美国独立战争结束时(1783年），被让给了美国
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