Why is the South so conservative?

[Frodo]

The idea that Southerners only vote for Conservatives based on social issues, and are actually very receptive to liberal programs such as socialized medicine is largely a myth. Southerners are quite fiscally conservative as well as supporters of tradition.

If by 'southerners' you are referring primarily to white southerners, then yes, I would agree with you.  They are on average more affluent than their black counterparts who are more economically populist.