Let's dispense with the obvious canard first: Republicans gave up on civil rights in the 1930s.
Really, please explain the vote counts for the civil rights act which had HEAVY BIPARTISAN SUPPORT.
Next, this lie of party switching is a liberal favorite, and it goes like this: following the civil rights act of 1964, Republicans turned to a strategy to appeal to racist whites and began dominating the deep South in elections. Problem is, that doesn't manifest in election data. Let's take a look.
Democrats claimed that by the 1968 election, Republicans had perfected the strategy, as this is evident in the election of Nixon. The problem is, Nixon lost a majority of South to an Independent. For the geographically challenged the "Deep South" consist of the following states; Georgia, Alabama, South Carolina, Mississippi, and Louisiana. Nixon LOST ALL THOSE STATES except for South Carolina. Well what about the 1976 election. Well no, that doesn't support the claim either. Carter carried every state in the Deep South. What about the 1980's? What about the 1980 Senate Election results? Senate elections would be an arbiter of your claim as each state has equal representation of two senators. Well Democrats GAINED in Louisiana and South Carolina and in 1982 they gained in Alabama...just more data that doesn't align with the claim of a solid racist red south. It wasn't until 1994, 50 years after the CRA of 1964, that Republicans won a majority of congressional seats in the South. Then, on top of all that, it was republicans in South Carolina who elected the first black man to call Congress since Reconstruction. His name is Tim Scott.
Now please, I don't have any more time today to devote to the reeducation of miseducated liberals.