Why has the Tulsa Race Massacre been largely forgotten?

What’s happening

Using ground-penetrating radar, scientists in Tulsa, Okla., recently discovered evidence of mass graves connected to the 1921 race massacre there. Like much of the evidence of the deadly event, the history of what’s been called “the single worst incident of racial violence in American history” has been buried.

In the early 1920s, the Greenwood District of Tulsa, home to most of the city’s black population, was a vibrant neighborhood that was so successful, it was known as "Black Wall Street." All that changed on May 31, 1921....