You were absolutely wrong when you claimed that the South returned to voting Democrat for decades after the 1964 election when the South went for Goldwater.
I don't usually use Wikipedia as a source, but I'm pretty sure they have this right and in its condensed form, it is easier to post than digging out the information from more trustworthy sources. (Emphasis mine.)
Southern Democrats are members of the U.S. Democratic Party who reside in the American South. In the 19th century, they were the definitive pro-slavery wing of the party, opposed to both the anti-slavery Republicans (GOP) and the more liberal Northern Democrats. . . .
. . . .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, white voters who became tolerant of diversity began voting against Democratic incumbents for GOP candidates. The Republicans carried many Southern states for the first time since before the Great Depression.
When Richard Nixon courted voters with his Southern Strategy, many Democrats became Republicans and the South became fertile ground for the GOP, which conversely was becoming more conservative as the Democrats were becoming more liberal.
However, Democratic incumbents still held sway over voters in many states, especially those of the Deep South. Although Republicans won most presidential elections in Southern states starting in 1964, Democrats controlled nearly every Southern state legislature until the mid-1990s and had a moderate(although not huge) amount of members in state legislatures until 2010. In fact, until 2002, Democrats still had much control over Southern politics. It wasn't until the 1990s that Democratic control gradually collapsed, starting with the elections of 1994, in which Republicans gained control of both houses of Congress, through the rest of the decade.
Southern Democrats - Wikipedia, the free encyclopedia
From your own link:
After the signing of the Civil Rights Act of 1964, white voters who became tolerant of diversity began voting against Democratic incumbents for GOP candidates. The Republicans carried many Southern states for the first time since before the Great Depression.
That's bullshit. Goldwater didn't win the South because Democrats who had become 'tolerant' voted for him. Goldwater won the South because the Democratic Party at the national level had become intolerant of segregationists.
(cough). Did you really read what you just wrote? Sometimes in an effort to be right, it is really easy to find yourself arguing with yourself.