Best Case Scenario for Blacks in a Union post Confederate victory?

Would this vary by region though?

On another note didn't de-facto segregation persist until the 1960s OTL?

Yes & Yes. In the second case some groups became acceptable pre 1960. ie: The Germans swiftly blended in during the 1920s by ceasing to do 'German' things. Like using German in business and public events. Others had a tougher time of it & still could not buy a house on East A Street in 1960.
 
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