Civil Rights, if it happens, will focus more on exclusionary tactics such as redlining alongside Jim Crow, just because more people would be affected. Frankly, not tackling it was Civil Rights' biggest missed opportunity OTL. Forced school district consolidation and school busing would take priority moreso than OTL, due to the Northeast and Midwest's emphasis on municipalities handling schools as opposed to counties. This leads to more segregated schools. (For example, my NC high school was built in 1969 to replace small, effectively segregated schools for three towns, and the result is a large high school that houses all demographics across half the county.) In a place like say, Buffalo, NY, suburbs can split from the city more easily and set up their own schools, or use preexisting towns as hard to redraw school districts. The result is that Buffalo has the 2nd most segregated schools in the country, behind Long Island. A larger Great Migration would make this problem even more pronounced.