You got it, RTR. Canada will became the driving force behind the United States of North America (USNA) while it's ripping up those Russian flags planted on the bottom of the Arctic Sea.
USNA will start with around 93 PUs (political units) loosely following the latest number of 12 Canadian provinces and territories, 50 U.S. states, and 31 Mexican states.
Headquarters will be in Austin near the geocenter with major regional centers in Winnipeg, Wichita, and San Luis Potosi. Once again, Rand McNally shows us the logical locations for regional capitals.
Washington, Ottawa, and Mexico City will be interesting tourist destinations like Williamsburg.
When the rest of the North American region is added, USNA will encompass seven Central American nations plus Cuba, Jamaica, Bahamas, and West Indies, another 20 or so nations.
Or it might go the other way, e.g., the Nine States of North America or whatever that treatise was on the more "natural" regionalization.
No telling what will happen as interested informed citizens unite in their own best interests.