Since you northerners are already digging a footing down 4 feet or more and then stem walls, then you may as well build a basement instead of just pushing dirt in. Basements are only a couple bucks more up north.
The warmer folks have no need to dig down so they benefit from having their pipes, plumbing, and wiring exposed to below with a crawlspace system. We can still have basements but it would require lots of concrete.