Here is the link you can click it's titled "When Parties Swap Platforms: the Changing Racial Policies of Democrats and Republicans". Yes, there you go just click. I warn you this is a lengthy read with lots of detail and lots of sources to enforce accuracy and authenticity of the information. But if reading isn't your thing just watch this video of Trevor Noah basically summing up in just under 8 minutes what the thesis proves evident.
If that's not comprehensive or simple enough, I'll break it down in a single sentence; KKKonservatives were racists as Democrats and are still racists as Republicans!
So there you have it. Now conservatives you have no excuse except that you CHOOSE to be ignorant dumb asses rejecting the facts and truth. Want my advice? Quit being that alcohoic who never admit they have a drinking problem. You don't like being called a racist? Well stop partaking, supporting, and purporting racist shit! First you'll have to admit your bigotry then you can do the work of unlearning years of lies, hate, ignorance and bullshit. Like anything else you dedicate yourself to it can be done. But the first step of solving any problem is first admitting there's IS as problem.