Southern Dems at least since the days of Wilson were some of the loudest voices for internationalism and foreign interventionism with some obvious exceptions including Senator Reynolds of North Carolina. Along with some ex-Socialists, they formed the basis of the neoconservative movement that would help bring Reagan into office.
Wallace's foreign policy reminded me a lot of Trump's. Stay out of foreign entanglements unless you're sure of victory, then go all in.
Wallace had more of a "Jacksonian" foreign policy, which befit his largely up country South base.
Coincidentally, in the South, Trump shares largely the same base of support.
Many of these same areas saw Democratic gains or solid holds in 2006 against Bush era Republicanism.
What sort of foreign policy did “down country” Southern politicians favor?
