What is the significance of mentioning "the coming into force of the Constitution (Fifty-seventh Amendment) Act, 1987" in this context?
The significance of mentioning "the coming into force of the Constitution (Fifty-seventh Amendment) Act, 1987" in this context is to specify the date from which certain provisions related to reserved seats for Scheduled Tribes in the Legislative Assemblies of Arunachal Pradesh, Meghalaya, Mizoram, and Nagaland will come into effect. This amendment was made on September 21, 1987, as indicated by the w.e.f. (with effect from) date mentioned in the text.