law: The Assam Reorganisation (Meghalaya) Act, 1969
  Part II
  Formation of The Autonomous State of Meghalaya
  3. Formation of Meghalaya.-
  (1) On and from the appointed day, there shall be formed within the State of Assam an autonomous State to be known as Meghalaya which shall, subject to the provisions of sub-section (2), comprise the following tribal areas, namely:-
  (i) The United Khasi Jaintia Hills District as described in sub-paragraph (2) of paragraph 20 of the Sixth Schedule to the Constitution (exclusive of the proviso thereto) but excluding the areas transferred to the Mikir Hills autonomous district by the notification of the Government of Assam No. TAD/R/31/50/149 dated the 13th April, 1951, and
  (ii) the Garo Hills District specified in Part A of the table appended to paragraph 20 aforesaid.
  (2) If, before such date as the Central Government may, by notification in the Official Gazette, fix for the purpose not being a date later than the appointed day, the District Council for the autonomous district of the North Cachar Hills or the Mikir Hills or both, as the case may be, has or have by resolution passed by a majority of not less than two-thirds of the members thereof, expressed a desire that the said autonomous district or districts shall form part of Meghalaya, the President may, by order, make a declaration to that effect and accordingly, on and from the appointed day, the North Cachar Hills District or the Mikir Hills District or both, as the case may be, shall also form part of Meghalaya.