What was a major reason that the slogan "states' rights" became tarnished in the 1950s and 1960s?

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In the 1950s and 1960s, opponents of the civil rights movement in the South used the slogan of "states' rights" to defend and perpetuate Jim Crow laws and racial segregation. This tarnished the slogan and made it a symbol of resistance to civil rights and racial equality. The phrase became associated with anti-black discrimination and resistance to progress on civil rights issues.

What Was a Major Reason That the Slogan "States' Rights