Why did minorities stop voting republican?

I've been looking up history about political affiliations in the U.S. and the Republican party was popular among the minorities and liberals. The party abolished slavery, fought for minority voting rights, fought Jim Crow, so on and so on. And the Democrats were popular with the Klan. How did that change.... show more I've been looking up history about political affiliations in the U.S. and the Republican party was popular among the minorities and liberals. The party abolished slavery, fought for minority voting rights, fought Jim Crow, so on and so on. And the Democrats were popular with the Klan. How did that change. I'm not a republican or democrat it just seems like a very drastic change of opinion.
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