In the seaside city of Newport, Rhode Island, the corner where Farewell and Warner streets cross is sacred ground. Here, inside the city’s oldest public cemetery, is the area known as God’s Little Acre, the country’s oldest and largest collection of burial markers of both free and enslaved Africans. During the summer months, when tourists flock to the seaport, lush green blades of grass surround the markers. And when cold winds replace the blustery summer breeze, the stones defiantly jut out from the snow. About 200 markers stand in this…