LAWNSIDE, N.J. – The tiny reddish-orange flags that dot a corner of the historic Mount Peace Cemetery in Lawnside, New Jersey, tell a story. They mark more than 200 newly uncovered graves in the sprawling cemetery established in 1900 as a private, nonsectarian resting place for Black Civil War veterans, former enslaved people, and those who could not be buried in white-only cemeteries. After years of neglect, the three-acre section in the back of the cemetery was covered with thick growth and not accessible for at least five decades, said Dolly L. Marshall, who serves on the board of the Mount...