Based on the map, what natural feature forms the northern political boundary of several Midwest states?

The midwestern United States, often referred to simply as the Midwest, is one of four census regions of the United States Census Bureau (also known as "Region 2"). It occupies the northern central part of the United States. It was officially named the North Central Region by the Census Bureau until 1984. It is between the northeastern United States and the western United States, with Canada to its north and the Southern United States to its south.

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Great Lakes

Explanation:

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