No nation can survive when it kills off its infant girls and cannot sustain sensible reproduction.
That's wildly inaccurate.
Among Chinese age 0-14 (the age group most thoroughly impacted by the one child policy) the percentage of males is 53%. In the US it's 51%.
In terms of demographics this is an enormous difference and has a real social impact on China (that's almost 20 million men, or the whole population of New York state, without realistic marriage prospects).
But the ratio of 5 to 1, or 83% male is way, way off base.
Hardly. The ratio at birth is about 1.09 males per 1 female. Other estimates put it as high as 1.18 males per every female.