The Party supported Truman. I think the Party remained behind the national Party for quite some time.
Well they voted for Goldwater in 64 and Wallace in 68, so the 1948 result jumped out as odd to me.
64 and 68 were post-Civil Rights act. The machine was dead and the Republican conversion began. Unfortunately, the Jimmy Carter anomaly doesn't make this clear on paper.
Or you could explain it as the fact that segregation was no longer a viable political force, which has the added virtue of being true.
You're right, but 20 years later Wallace won Georgia, as well as Arkansas, both states lost by Thurmond.