I can prove what I said (and everyone should already know it) but you can't prove what you say (because it isn't true). So why do you say it?
Lets look at the GOP conservative movement. The Dixiecrats split from the Democratic Party in 1948 and ran Strom Thurmond as their candidate for president. They lost but almost cost the election for the democrats. Truman won. Afterwards the Dixiecrats had to find a home. Some like Strom Thurmond became Republicans in the 1960s and other like the infamous Bull Connors continued to run as Democrats and win. You may ask what does this have to do with GOP conservatism and here is your answer. In 1964 the watershed Civil Rights Act was passed by both the house and senate with a great percentage of Republicans than Democrats. All the Southern Democrats (of 21 votes) save one voted against the act. That exception was Richard Byrd of West Virginia. So we have an example of Southern democratic solidarity against Civil Rights. How about the GOP? Six Republican Senators voted against the Civil Rights act. Barry Goldwater (yes, the father of conservatism) of Arizona, Hickenlooper of Iowa, Cotton of New Hampshire, Mechem of New Mexico, Simpson (not Alan) of Wyoming, and Tower of Texas. So only one Southern Republican voted against the Civil Rights act and the reason given was that the federal government should not be dictating to the states what should be a state issue.
So far we have a solid block of Southern democrats voting against black civil rights and one Texan republican voting against. Sounds like a Southern Democrat problem.
Lets move on. Actually there is no real need to move as that one vote demostrates where the parties stood in 1964. You did say Southern Republicans though. Goldwater was from Arizona, Buckley was from New York, Irving Kristol was from New York, Reagan was from Illinois. Nope, not one Southerner in the bunch. By the way, the afore mentioned Strom Thurmond voted against the Civil Rights Act and then became a Republican later in the year. He then appointed the first black man as a staffer in the South Carolina delegation and voted for the Martin Luther King Jr. holiday. It was also revealed that he had a bi-racial daughter who he supported through college and showed great affection for her though not admitting that he was her father.
To conclude; The GOP conservative movement has roots from all across the United States but the deepest roots are in New York and the shallowest roots are in the South. Whereas the liberal, racist roots in the Democratic Party are definitely in the South just ask Albert Gore Senior who tried to stop the 64 Civil Rights Act with a filibuster.
http://www.nytimes.com/learning/gene.../big/0619.html