Here you go:
During the 1930s, as the New Deal began to move Democrats as a whole to the left in economic policy, Southern Democrats were mostly supportive, although by the late 1930s there was a growing conservative faction. Both factions supported Roosevelt's foreign policies. By 1948 the protection of segregation led Democrats in the Deep South to reject Truman and run a third party ticket of Dixiecrats in the 1948 election. After 1964, Southern Democrats lost major battles to the civil rights movement. Federal laws ended segregation and restrictions on black voters.
After World War II, during the civil rights movement, Democrats in the South initially still voted loyally with their party. After the signing of the Civil Rights Act of 1964, the old argument that all whites had to stick together to prevent civil rights legislation lost its force because the legislation had now been passed. More and more whites began to vote Republican, especially in the suburbs and growing cities. Newcomers from the North were mostly Republican; they were now joined by conservatives and wealthy Southern whites, while liberal whites and poor whites, especially in rural areas, remained with the Democratic Party.[1]
The New Deal program of Franklin Delano Roosevelt (FDR) generally united the party factions for over three decades, since Southerners, like Northern urban populations, were hit particularly hard and generally benefited from the massive governmental relief program. FDR was adept at holding white Southerners in the coalition[2] while simultaneously beginning the erosion of Black voters away from their then-characteristic Republican preferences. The Civil Rights Movement of the 1960s catalyzed the end of this Democratic Party coalition of interests by magnetizing Black voters to the Democratic label and simultaneously ending White control of the Democratic Party apparatus.[3] A series of court decisions, rendering primary elections as public instead of private events administered by the parties, essentially freed the Southern region to change more toward the two-party behavior of most of the rest of the nation.
In the presidential elections of 1952 and 1956 Republican nominee Dwight David Eisenhower, a popular World War II general, won several Southern states, thus breaking some white Southerners away from their Democratic Party pattern. The passage of the Civil Rights Act of 1964 was a significant event in converting the Deep South to the Republican Party; in that year most Senatorial Republicans supported the Act (most of the opposition came from Southern Democrats), but the Republican Party nominated for the Presidency Arizona Senator Barry Goldwater, who had opposed it. From the end of the Civil War to 1960 Democrats had solid control over the southern states in presidential elections, hence the term "Solid South" to describe the states' Democratic preference. After the passage of this Act, however, their willingness to support Republicans on a presidential level increased demonstrably.
https://en.wikipedia.org/wiki/Southern_Democrats
Too bad you have to insult when you disagree. Doesn't strengthen your argument and just makes you look rather silly.