Some take this period as the establishment of separate colonies, but that did not officially occur until 1729 when seven of the Lords Proprietors sold their interests in Carolina to the Crown, and both North Carolina and South Carolina became royal colonies. The eighth share was Sir George Carteret's, which had passed to his great-grandson John Carteret, 2nd Earl Granville. He retained ownership of a sixty-mile-wide strip of land in North Carolina adjoining the Virginia boundary, which became known as the Granville District. This district was to become the scene of many disputes, from 1729 until the American Revolutionary War, at which time it was seized by the North Carolina revolutionary government.