China has been over populated for hundreds of years, due to the fact some people wanted to have sons to carry on the family name. And at one time they had a great surplus of food.
The horrific famine in the fanatic "great leap forward" starved 45 million people to death....and Mao need people to build country and ready to die in war again.... www.chinauncensored.com/
article : What is Really Behind the "One Child Policy"?