I think that North America would make for a great land as well! Though I personally would stress a focus on Native Americans rather than European settlers, and I would personally like to a see Alaska instead of WyomingI recently spent a week at Yellowstone. Awesome. The scenery, thermals everywhere.. Wolves, Bison, Grizzlies, Elk, Mule deer (ever see a mule deer run, funny), Big Horned Sheep, and cowboys. Well the cowboys were in Cody but still neat to see. It would make a great land.
You have to remember that a lot of the people coming to WDW are from another country and it would be different for them.