I have worked on these questions with @eucascio @NoraEGordon @ethanglewis!
A thread on some of the things we learned about the Federal role in deseg in the 50s, 60s, 70s.
(Many have written on this; I summarize some of my own work here.)
-Dual system was illegal and courts were involved, so 1964 is not even pure "leave it to the locals" outcome
-There was somewhat more deseg in the Border region, but data are incomplete, so we focus on the former Confederacy in this work
Paper here: doi.org/10.1016/j.jue.…
More Federal enforcement, by Federal Courts and by the Executive
First, the 1964 Civil Rights Act authorized Justice Dept to bring/join cases --> more districts litigated-->more court ordered deseg
(typically wasn't "busing" at this time)
1965 Elementary & Secondary Education Act authorized new Fed $$ for K12
We show threat of withdrawal of Fed $$ (CRA) + increase in $$ on the table (ESEA Title I) encouraged desegregation
doi.org/10.1162/qjec.2…
Guidelines more stringent over time -->
Courts draw on Guidelines -->
Court ordered plans more stringent (Green & Swann decisions) -->
more desegregation after 1966
Districts that had not dismantled desegregation were increasingly likely to come under Court order after 1970
By 1976, about half of Deep South school districts were supervised by a Court
Federal enforcement was effective
jstor.org/stable/4129552
Federally mandated school desegregation was effective
Several papers suggest desegregation improved outcomes for blacks along a number of dimensions (will try to do another thread)
But the changes were big and important and not something locals were going to do without Federal pressure