Among the most lasting and indelible images of the civil rights movement were the nine black teenagers who had to be escorted by federal troops past an angry white mob and through the doors of Central High School in Little Rock, Arkansas, on Sept. 25, 1957.

Six decades later, the sacrifice of those black students stands as a symbol of the turbulence of the era, but also as a testament to an intractable problem: Though legal segregation has long ended, few white and minority students share a classroom today.

The lack of progress is clear and remains frustrating in the school district that includes Central High. The Little Rock School District, which is about two-thirds black, has been under state control since 2015 over the academic performance of some of its schools. The district has seen a proliferation of charter schools in recent years that opponents say contributes to self-segregation.

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