N.C. Gen. Stat. § 160A-471

Each unit of local government initially adopting a concurrent resolution under G.S. 160A-470 shall become a member of the regional council. Thereafter, any local government may join the regional council by ratifying its charter and by being admitted by a majority vote of the existing members. All of the rights and privileges of membership in a regional council of governments shall be exercised on behalf of its member governments by their delegates to the council.