Friday marks the 70th anniversary of the landmark Brown v. Board of Education decision, in which the Supreme Court ruled that the “separate but equal” schools for racial minorities were inherently unequal and unconstitutional.

But so many years after the watershed ruling, new research confirms a startling trend: School segregation has been getting steadily worse over the last three decades.

Researchers at Stanford University and the University of Southern California found that racial segregation in the country’s 100 biggest school districts, which serve the most students of color, has increased by 64 percent since 1988. Economic segregation, or the division between students who receive free or reduced lunch and those who do not, increased by 50 percent since 1991.

The study primarily focused on white-Black segregation, the groups that the Brown decision addressed, but found that white-Hispanic and white-Asian segregation both also more than doubled since the late 1980s in the large school districts.

... read more at vox.com