The DC suburbs.
A small African settlement was formed on Beacon Hill which overlooks the site of the Indian town. This was quite possibly the first urban area in what is now the United States to be occupied by Africans.
Over a century later the African town was included within the bounds of Mount Vernon once European settlement moved North of the Rappahannock. George Washington was very solicitous of the folks who lived there. They are the ones he freed in his will.