’s government imposed a one-child policy, which limited urban families to a single child and rural families to two children.

China

Explanation:

China placed the one-child policy in the late 70's and early 80's.

map scale refers to the relationship (or ratio) between distance on a map and the corresponding distance on the ground. for example, on a 1: 100000 scale map, 1cm on the map equals 1km on the ground.