It always bothers me when someone puts into one or two sentences that which I have been trying to express in a few thousand words. That is indeed, the idea in the nutshell, thank you for making it so succinct. The Apaches contolled the Southern Rockies. As long as they kept other humans out, they had plentiful game and forest products, water and a warm climate. The world really worked for these guys, so their interest was in keeping paradise the way it was. The Comanches ranged from Wyoming to South Texas, starving and freezing as they went along, so they were more open to adopting innovations from a foriegn society like metal tools, horse culture,etc and were just beginning to show the signs of evolving into a more fixed society, while the Apaches were still essentially cave men. Of course, neither one did it fast enough for us, so we killed most of them and put what was left on a farm so they could really figure out it was dig or die.