The Loudoun County School Board announced its plans to apologize for operating one of the nation’s longest-running segregated school systems.

A formal apology will be issued this September, along with a video documenting the history of segregation in the county’s public school system, and the impacts of segregation on the county’s Black residents. The Loudoun County Board of Supervisors is also invited to participate in the apology.

The announcement from Virginia’s third-largest public school system comes as thousands of people are gathering in D.C. to march for police accountability and civil rights. Friday, Aug. 28 is also the 57th anniversary of Dr. Martin Luther King Jr.’s “I Have A Dream” speech.

“Even as Americans drew inspiration for Dr. King’s call for unity and equal treatment under the law, Loudoun County resisted the legal and moral requirements to integrate its schools for over a decade, following more than a century of documented inequities between schools serving white students and those serving Black students,” reads a statement from superintendent Eric Williams.

Since 2016, a volunteer team of Loudoun County residents, historians, and students have read more than 10,000 pages of records from 1864 to 1968, documenting the history of segregation and the learning conditions for the county’s Black students. The team of volunteers, named the Edwin Washington Project, plans to publish its research in the form of books, articles, and an online database at the end of this year, according to the Washington Post.