The six nation proposal has only one 'swing' region between current Democratic and Republican party control. However, some regions that border a new proposed nation would be on 'the outs'. I look at two areas: the 13 counties in Oregon in the Greater Idaho movement and the western counties of Virginia who probably would not want to be in the new New England based nation.

Resources:

https://www.politico.com/2024-election/results/virginia/

https://www.politico.com/2024-election/results/oregon/

https://ballotpedia.org/Greater_Idaho,_Oregon,_countywide_ballot_measures_(2020-2024)

https://greateridaho.org/