To the extent that there are new activities undertaken pursuant to this chapter, those activities shall supplement, not supplant, activities, programs, and local actions that are ongoing on October 27, 1986. Such activities shall be undertaken in the manner least disruptive to tribal control, in accordance with the Indian Self-Determination and Education Assistance Act (
25 U.S.C.
450 et seq.), and local control, in accordance with section
2010 of this title.