Write a question about the following article: The English offered Chief Blount control of the entire Tuscarora tribe if he assisted the settlers in defeating Chief Hancock. Chief Blount captured Chief Hancock, and the settlers executed him in 1712. In 1713 the Southern Tuscarora lost their Fort Neoheroka, located in Greene County. About 950 people were killed or captured and sold into slavery in the Caribbean or New England by Colonel Moore and his South Carolina troops. His forces were made up of 33 white men and more than 900 Native American allies, mostly Yamasee and Cherokee, historic competitors to the Tuscarora. At this point, the majority of the surviving Southern Tuscarora began migrating to New York to escape the settlers in North Carolina. Their leader declared that those remaining in the South after 1722 were no longer members of the tribe. They joined the Five Nations of the Haudenosaunee or Iroquois Confederacy, and were accepted as the sixth nation. The remaining Tuscarora signed a treaty with the settlers in June 1718. It granted them a tract of land on the Roanoke River in what is now Bertie County. This was the area already occupied by Tom Blount, and was specified as 56,000 acres ; Tom Blount was recognized by the Legislature of North Carolina as King Tom Blount. The remaining Southern Tuscarora were removed from their homes on the Pamlico River and forced to Bertie. In 1722 the colony chartered Bertie County. Over the next several decades, the remaining Tuscarora lands continually diminished as the tribe sold off land in deals which speculators designed to take advantage of them.
How many years after settlers were granted a tract of land on the Roanoke River did the colony charter Bertie County?