What differentiates Montana and the Dakotas?

[ElectionsGuy]

The eastern parts of the Dakotas are much more lean republican and moderate than their western sides, they wouldn't be safe republican states without their western ends (Rapid City and Bismark). Eastern Montana is mostly like the western Dakotas, very republican and very oily (very much like Eastern and Northern Wyoming too). Billings is like Rapid City and Bismark too. while Montana west of the continental divide is very laborish and I hear there are mining unions there too in places like Missoula and Butte. At least that what I hear. I tend to differentiate all three states by the Eastern and Western ends.