I heard that the Dems fought for the South in the American Civil War. True or false?
Was I not clear on the political party alignment prior to the Civil Rights movement? It seemed like I was, when I stated that the South was Democratic for a long, long time? Technically, no political parties fought for the South, as the Confederacy didn't actually recognize any political parties at all, and the predominant view was that they were not worth it and were a corruption of Republican government (the system of government, not the political party). A lot of the Confederate Congress were formerly Southern Democrats, as that was the the status quo pre-Civil War.
The national party started to fracture with the lead-up to the Civil War. Southern Democrats were almost entirely pro-slavery, while Northern ones started to split with the South. In fact, at one point in 1860, Southern and Northern Dems actually nominated different candidates.
Here's a pretty detailed article on Southern Democrats as a bloc and their defense of slavery, through New Deal and Civil Rights, leading to the eventual shift of white, conservative voters to a solid Republican bloc in the South, with more liberal voters, along with almost all minorities, switching to a Democratic vote. With some old-timer white conservatives still clinging to the Democratic party name, nationally, into the 90s.