Living in an unpopulated place is one thing, and living in wilderness is another. The places you mention, Montana, Idaho, Washington, have real wilderness thanks to government owned lands, national forests and parks etc that you just aren't going to find in Texas or Georgia. I know there are remote places in those states, but both have been mostly fucked up by private land owners taking it all over, deforesting it, and putting fences around it.
I lived in a very remote place in the mountains of CA for 2 years. It took a while for my wife to get used to it, but when we finally had to leave, it tore our hearts out. It was great.