The Ohio River Valley is a crucial geographical area in U.S. history that served as a contested borderland between French and British territories before becoming an important part of westward expansion after independence.
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French and Indian War: A war fought over control of this region among other things between Britain and France with various native tribes aligning with both sides.
Northwest Ordinance: Legislation passed by Congress under Articles of Confederation that organized settlement in Northwest Territory including parts of Ohio River Valley.
Louisiana Purchase: The acquisition by United States from France which included lands west of Mississippi river expanding influence over Ohio River valley.