<s>[INST] When did the State of Mizoram Act, 1986 come into effect? [/INST] The State of Mizoram Act, 1986 came into effect on 20-2-1987. This is specified in the text as follows: "4. Ins. by the State of Mizoram Act, 1986 (34 of 1986), s. 4 (w.e.f. 20-2-1987)." </s>