中国の一人っ子政策がはじまったのはいつ？
China's one-child policy was part of a birth planning program designed to control the size of its population. Distinct from the family planning policies of most other countries (which focus on providing contraceptive options to help women have the number of children they want), it set a limit on the number of children parents could have, the world's most extreme example of population planning. It was introduced in 1979 (after a decade-long two-child policy), modified in the mid 1980s to allow rural parents a second child if the first was a daughter, and then lasted three more decades before being eliminated at the end of 2015. The policy also allowed exceptions for some other groups, including ethnic minorities. The term one-child policy is thus a misnomer, because for nearly 30 of the 36 years that it existed (1979–2015) about half of all parents in China were allowed to have a second child. 
1979