I was speaking to the the membership of the Democratic party in the south--more than the politicians...many racist Jim Crow loving Democrats stayed in the party..because they did, truly represent their districts, after all. Politicians are going to go with what keeps them in office.
It was a gradual process, as these sorts of things are. But the move that started with the Dixicrats of the 50's...was completed by 1980. The Dems of 1940 became the R's of 1980..but still conservative. Reagan reaped the rewards of that switch.
But the south DID shift Republican, and was always predominantly Conservative..no matter the party affiliation.
As other posters have pointed out..you and your party want to make it about parties..when it has always been about ideology. The conservative ideology of the southern white voter has not changed all that much...except in this--that the cities are Democratic strongholds..and they are often able to rule the rural areas--despite the prevailing conservative attitude.
Thus rural vs urban equals Conservative and Liberal..but in a representative republic...it's the numbers that matter.
To the topic....This is the United States..we do not celebrate the holidays of traitors. It is a promising sign..that a southern state is moving to see that point.
I'll write it only once, so read carefully.
There was no "party switch". Bad guys did not become "good guys" and vice versa. The leftist academia story that sounds something like: "Republicans couldn't win national election and they appealed to the worst of the worst, i.e. to southern racists. It never happened.
You're conflating two different things here. And you know you are, because we had that whole standoff about how you tried to avoid post 50 which spelled out the so-called "party switch". Here for convenience is that lesson again -- begin paste:
"Big switch"

You're so afraid of acknowledging history that you'll pervert it into a "Big Switch" as if you're turning the lights on and off to the White House Frickin' Christmas Tree.
In the late part of the 19th century the Republican Party was moving away from its Liberalism that championed Abolition and civil rights, and toward the deep pockets of emerging corporations, the railroads, Wall Street etc. At the same time the Democrats, having experimented with "fusion" parties, absorbed the burgeoning Populist movement (and party). These two poles are personified in the two parties' POTUS candidates, William McKinley and William Jennings Bryan. McKinley was also driving the US toward imperialism, which was a new direction, with the Spanish-American War, and the Philippines continuing after it.
The Democrats took on the constituencies of minorities, the labor class and farmers, immigrants, and of course with those minorities/immigrants came Jews, Catholics and eventually blacks in the 1930s. The Republicans took on the wealthy, the "haves" and the enormous wads of money that came with them. For a brief blip that trajectory was somewhat interrupted by Teddy Roosevelt who made a lot of noise about actually reeling in those corporations -- he was never in the plan to be President, he succeeded to it when McKinley was assassinated --- and that rocked the Republican boat. For evidence that it rocked that boat look to 1912, when TR came to the party convention with a commanding lead of primary delegates, yet the party snubbed him and went with Taft, the establishment guy from Ohio, who was willing to toe the corporate line (which is why TR challenged him).
Roosevelt had to go form his own party, which he did and which sent Taft down to third place and handed the WH to Woodrow Wilson with something like 42% of the vote. But 8 years later the Republicans won back the WH with what was then the biggest landslide ever, with their one-percent guy, and the rest is history.
So "Big Switch", no not a "switch". More like a mutual evolution. It took a generation to evolve, but it did.
/end post 50 paste
That's when the parties in significant ways traded places as far as their values and their constutuencies. The other thing you're (deliberately) conflating with it is the "Southern Strategy", when the VOTERS, rather than the parties, changed positions. That would be beginning in the 1960s, specifically when LBJ pushed the CRA through and lamented "we (Democrats) have lost the South for a generation", when Strom Thurmond made the word flesh by doing the heretofore unthinkable and switching to the "Party of Lincoln". He was eventually followed by a cast of thousands including Trent Lott (who "voted for him" in 1948), Jesse Helms, Sonny Perdue, Nathan Deal, John Connally, Fob James, Kay Ivey, Dave Treen, David Duke, Richard Shelby, Phil Gramm, Elizabeth Dole, That Cochran, Billy Tauzin, Buddy Roemer and of course their voters from what before Thurmond's break had been called the "Solid South". They were of course following their voters, once Thurmond demonstrated that the Republican Party was going to be the natural home for their eternal conservatism. That they had ever been Democrats was a fluke of circumstance born of the emotional revulsion for the "party of Lincoln", the figure who had defeated and humilated them.
With that floodgate opened and the "party of Lincoln" becoming thinkable came the Republican Southern Strategy, infamously voiced by Republican strategist Lee Atwater:
>> You start out in 1954 by saying, "
******, ******, ******." By 1968 you can't say "******"—that hurts you. Backfires. So you say stuff like
forced busing, states' rights and all that stuff. You're getting so abstract now [that] you're talking about cutting taxes, and all these things you're talking about are totally economic things and a byproduct of them is [that] blacks get hurt worse than whites. <<
--- and in fact that's exactly what Reagan did, tellingly kicking off his campaign in of all places Philadelphia Mississippi, site of one of the most notorious terror crimes of the civil rights era, talking about "states rights" --- the exact same phrase the Democrats had been using in the Civil War daze and were still using (George Wallace).
So that's both a constituency migration AND an ideological one. The Democrats abandoned the racist vote, punctuating it with the 1964 CRA, and the Republicans took up the invitation.
So your "big switch" was never a 'switch" -- it was a gradual evolution, in two phases.
Republican party has been always champion of civil rights and party of emancipation, from its inception, thru civil war, passing 13th, 14th and 15th Amendments, and passage of 1964 CRA. Blacks were already largely Democrats before Johnson signed CRA, and have been for some time. In 60's Kennedy won nearly 70% of black vote, mostly due to FDR's "new deal".
You mentioned Dixicrats, name came from Southern Democrats (Dixie + crats), from which very small percentage became Republicans. I asked lefties here to name five racists that left Democratic party and switched to Republican. It doesn't matter how many times I asked, that list never get populated. Pretty much all racists, with few exceptions remained Democrats.
There were TWO (2) Dixiecrats, one being the aforementioned Strom Thurmond and the other his running mate, Fielding Wright, then-governor of Mississippi. When they failed to upend the 1948 election they went back to their governorships, Wright then went back to his law practice, Thurmond decided to run for Senator and was kicked off the ballot by the state Democratic Party so he ran as a write-in, which he won, and that's how he got to the Senate.