The policy to be followed for the attainment of the objective established by section 8302 of this title, and for the more effective exercise by Congress, the executive branch of the Federal Government, the Mayor of the District of Columbia, and all other officers, agencies, and instrumentalities of the District of Columbia of their respective functions, powers, and duties in respect of the Washington metropolitan region, shall be that the functions, powers, and duties shall be exercised and carried out in a manner that (with proper recognition of the sovereignty of Maryland and Virginia in respect of those areas of the Washington metropolitan region that are located within their respective jurisdictions) will best facilitate the attainment of the coordinated development of the areas of the Washington metropolitan area and the coordinated management of their public affairs so as to contribute effectively to the solution of the community development problems of the Washington metropolitan region on a unified metropolitan basis.