@ Caliboy
Denton,TX has potential but really unless it usurps Dallas for being a financial center, attracts EDS, TI, and so forth in much greater numbers (they do have Boeing and a TI workshop) as Garland and Richardson did or usurps Fort Worth's railroad/stockyards before 1900, there's not really much reason to pick it over what did grow to 300K or so like DFW suburbs did.
Also keep in mind Denton didn't have the Trinity River (chuckle, snort, more like a muddy creek most months) as a ready water source until the Corps of engineers dammed it up to create Lake Lewisville and Lake Dallas.
Montana has resources out the yin-yang and very pretty country, but it's kinda out in the middle of nowhere and dry, plus the weather sucks six months a year so without some major land rush most folks don't see a reason to stick around.
You could make an argument of Helena or Butte becoming a booming metropolis based on another silver/copper strike or being a major hub of a northern IC RR or some big railhead to Calgary or somesuch.
Omaha has a major hub of the UP RR, meatpacking, insurance companies and a very diversified economy, so it's doing really well. IDK what you want it to be.
Nashville suffers from the same problem of the North Carolina cities across the Piedmont. They grew up as markets for the farms surrounding them that didn't trade outside their region terribly well b/c they didn't have ready river or RR access until after the ACW, and that area's a nightmare to build and maintain roads with all the Appalachian hills/mountains.
Following another development path (something where the South industrializes much earlier and had a much more friendly attitude toward public works from 1800-present) Nashville could be a much more industrialized city.
IDK what to say about Tillamook- nice cheese?
Here's a thought. WI the Mormons colonized Oregon as heavily as they did Utah and Tillamook become the place where they put the Temple??