I would add the Canadian provinces to your map: British Columbia joining the West Coast (green) states, Alberta the Mountain West (brown), Saskatchewan and Manitoba the Great Plains (red), Ontario the Great Lakes (grey), Québec and perhaps all or part of New Brunswick in a Francophone region of their own, the Maritimes with the U. S. Northeast (blue). Not sure what becomes of Alaska, the Yukon, the NWT, and Nunavut: maybe an Arctic regional entity of their own, with Nunavut hooking up with autonomous Kalaallit Nunaat (Greenland).