Explanation:

National Register of Citizens, 1951 is a register prepared after the conduct of the Census of 1951 in respect of each village. It shows the houses or holdings in a serial order and indicates against each house or holding the number and names of persons staying therein. The NRC for the whole country was published only once in 1951.

Before 1971, there was a huge exodus of people fleeing from the then East Pakistan (Presently Bangladesh) after the tyrannical suppression by West Pakistan. In 1979, All Assam Students Union (AASU) started a movement to deport the Bangladeshi immigrants quoting Changed demography Threat to Assamese Culture. This 6 year struggle culminated in the Assam Accord of 1985.