Question

china implemented the one - child policy in 1979 because the population was expected to exceed by the early 1980s. people 500 million 700 million 1 billion 1.3 billion

Explanation:

Historical demographic data shows that China's population was approaching 1 billion by the late 1970s, and projections at the time estimated it would exceed 1 billion by the early 1980s, which was a key driver for the one-child policy implementation.

Answer:

1 billion