While I agree that parts of states have the right to secede and become new states I think from a pragmatic perspective they would be better off simply becoming parts of different states. For example I wonder if the recent vote in Colorado would have gone differently if the question were “shall county X seek to be annexed by Wyoming” rather than to seek separate statehood. While getting Colorado and Wyoming to agree to that would be challenging, it would be less challenging than getting Congress to agree to another state.
Exactly right and why wouldn't Wyoming take parts of NW Colorado?