How long could have segregation lasted?

What's the maximum amount of time racial segregation in the United States could have lasted for? A POD in the 20th century is prefrable.
 
Lack of migration

I suspect that if the black population didn't migrate north, it would have been a lot slower. Preventing that requires that there be no abundance of jobs in the north. It was the World Wars that helped bring them north--so get rid of the two World Wars, and I suspect that it would be much slower in happening--although I hope not too much slower.
 
Are we talking legally mandated segregation, or de facto?

When I went to elementary in the 1970s, there was still segregation within the public schools. That continued well into the 1980s with practices like "tracking."

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http://www.projectcensored.org/top-...ore-segregated-today-than-in-the-1950s-source
US Schools are More Segregated Today than in the 1950s

in Top 25 Censored Stories for 2010


Source:
The Civil Rights Project, UCLA, January 2009
Title: “Reviving the Goal of an Integrated Society: A 21st Century Challenge”
Author: Gary Orfield

Student Researchers: Rena Hawkins, Southwest Minnesota State University
Melissa Robinson, Sonoma State University
Faculty Evaluator: Sangeeta Sinha, PhD
Southwest Minnesota State University
Schools in the United States are more segregated today than they have been in more than four decades. Millions of non-white students are locked into “dropout factory” high schools, where huge percentages do not graduate, and few are well prepared for college or a future in the US economy.
According to a new Civil Rights report published at the University of California, Los Angeles, schools in the US are 44 percent non-white, and minorities are rapidly emerging as the majority of public school students in the US. Latinos and blacks, the two largest minority groups, attend schools more segregated today than during the civil rights movement forty years ago. In Latino and African American populations, two of every five students attend intensely segregated schools. For Latinos this increase in segregation reflects growing residential segregation. For blacks a significant part of the reversal reflects the ending of desegregation plans in public schools throughout the nation. In the 1954 case Brown v. Board of Education, the US Supreme Court concluded that the Southern standard of “separate but equal” was “inherently unequal,” and did “irreversible” harm to black students. It later extended that ruling to Latinos.
The Civil Rights Study shows that most severe segregation in public schools is in the Western states, including California—not in the South, as many people believe. ....
 
A good POD would be Truman not integrating the services. That catalyst could arguably be the foundation of the Civil Rights era. Without that, Brown v. Board would have been a lot shakier and less likely to be decided positively. Then we get into a darker period with the late '60's with the rise of violent student and social activism. A massive "ghetto uprising" which might have occurred due to lack of progress would have caused a huge backlash.
 
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