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New Mexico –eastern
Colorado- eastern
Wyoming –northeast, all of the east
Montana about 3/5 of the north portion not nw- central east; east
These states are entirely on the interior plain:
North Dakota,
South Dakota
Nebraska,
Kansas
Iowa
Illinois
Indiana
Michigan except nw corner
Minnesota except northeast corner
Wisconsin except northern portion
All of Oklahoma except not parts of the east Not: Southeast corner
Ohio western half
Missouri northern half and portions of west and sw
Kentucky except eastern part and sw corner
Tennessee the entire central area, north to south is on the interior plain.