I’m not touching the timeline stuff, but just circling back to “north woods” not being Frontier. While images of Texas and Arizona might first spring to mind when thinking about “the frontier” it’s not the only place. Colorado, Wyoming, Montana, Oregon etc are just as much Frontier as the Southwest. Some of the great historical events of the Frontier era ( Oregon Trail, Lewis and Clark, 49er Gold Rush, the building of the continental railroad) took place at least partially in forested cooler climates where there are lots of bears. Heck Disneys contribution that spauned this land in DLR, Davy Crockett, takes place mostly in Tennessee.