Meghalaya comprises three main regions called Khasi hills, the Garo hills, and the Jaintia hills. The rulers of Garo and Khasi joined India in 1947.
Meghalaya was made a sub-state of Assam in 1969 under the Assam Reorganization (Meghalaya) Act, 1969. This was done according to the sixth schedule of the Indian constitution. The sixth schedule discusses the administration of tribal areas and their autonomy. Later Meghalaya received its statehood in 1972.