China and India are the most active in their state demographic policy, why?

The demographic policy of the authorities of China and India is associated with the overpopulation of these countries. Each of them has about 1.35 billion inhabitants, with India’s population growing faster. Historically, this was due to a warm climate, which will allow for more harvests than in Europe, for example, as well as developed agriculture and high birth rates in the 20th century, which coincided with the process of increasing life expectancy. China has long been pursuing a policy of “1 family – 1 child”, which contributes to the aging of the population. A large number of children in a family causes various restrictions on the part of the state.