OKLAHOMA CITY (AP) — As the U.S. marks 100 years since one of its most shameful historical chapters, researchers, including descendants of Black victims of the Tulsa Race Massacre, are preparing to resume a search for remains believed to have been hastily buried in mass graves.

Although many details about the two terrifying days in 1921 eventually came to light after decades of shared silence by perpetrators, victims and their progeny, some basic facts remain unknown, including the true death toll and the names of many members of the city's once thriving Black community who died at the hands o...