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Which present-day U.S. states and Canadian province were included in the Plateau culture area?

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The Plateau culture area encompasses parts of the following present-day U.S. states and Canadian province:

U.S. States: Montana, Idaho, Oregon, and Washington.1
Canadian Province: British Columbia.1

This region is situated between the Rocky Mountains and the coastal mountain systems, primarily defined by the watersheds of the Columbia and Fraser rivers.12