How about a global two child policies? The ideal is one boy and one girl in a family(at least in some places) so it shouldnt end up in majoryty male population and you still get a decline in population as even if every couple in the world has the maximum amount of kids you'd only end up with a steady population.Because that worked so well for China, which now has a large surplus of men and not enough women? Just remember, it wasn't the state that was killing female babies - it was the families, so there is no reason to think that wouldn't happen on a similar scale across large parts of the planet.
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