In the South, its (depending on where) Black folks, in Texas, New Mexico and Oklahoma, its Hispanic.
The fact that I see mexican/hispanic restaurants and groceries, in rural america (even in the south) tells me the world is changing.
So if rural America is gradually becoming that way, and thereby the rest of the world following suit, I guess the reason to travel would be to experience different cultures before they effectively come to us all (or disappear all together in some cases). But that's really more curiosity than anything else, like visiting a traveling museum exhibit that has a limited run.