Son-preference persists among second-generation migrants: https://jech.bmj.com/content/early/2018/06/19/jech-2018-210622 https://jech.bmj.com/content/early/201

Son-preference persists among second-generation migrants: https://jech.bmj.com/content/early/2018/06/19/jech-2018-210622 https://jech.bmj.com/content/early/2018/06/19/jech-2018-2106... And migration is ongoing - so the effects will continually be felt. Its not as if the intake is a once-off. I think its grounds enough to only allow female immigrants from these problem countries, in order to balance out the population.