The major contributing factors in the famine were the policies of the Great Leap Forward (1958 to early 1960s) and People's commune, in addition to some natural disasters such as droughts which took place during the period.
I know you need it quick so sorry that im sending without an explanation of my own so here :
The failure of agricultural policies, the movement of farmers from agricultural to industrial work, and weather conditions led to millions of deaths from severe famine.
