Reading through this thread it appears that the righwing trolls here are either BS'ing us about their lack of knowledge about dixiecrats and Nixon's successful push in 1968 to move the dixiecrats over to the GOP where they are a major part of the GOP base today, or they never paid the slightest bit of attention to their American History and Civics courses in school. That's stuff I learned in elementary school and junior high (nka middle school) decades ago (except I lived through the GOP's grab of the dixiecrats).
Assuming they are just ignorant, here is a greatly oversimplified summary. The GOP party started in the 1850s, primarily based upon abolition of slavery. Both the GOP and the Democratic Party included what we now call right and left wings. After the Civil War, the Democratic was the dominant party in the South as whites down there cursed the GOP as the party that caused the "war of aggression." The GOP grew more and more conservative in the late 1800s-although there were many, many moderate GOP well up to at least the Reagan administration. (As an aside, I grew up in New England and except in the cities the GOP was the dominant party here through the same era). In the twentieth century the Democratic Party's base was groups antagonistic towards each other-Dixiecrats on one side, big city and on the other, blue collar union workers and liberals, etc.
Basically what happened it that southern politicians that were first elected as Democrats switched in mass to the GOP. They were the exact same people with a new party label. Thus giving support to the trolls arguing terrible things Democrats did-when those people in fact became Republicans and continues to do the same stuff-disenfranchising voters for example.
It really isn't that hard to understand, its factual and well documented. The troll's purported ignorance has to be a put on.