[–] mralexson [S] 0 points 1 point 1 point (+1|-0) ago (edited ago)
Their birth rate weren’t particularly higher than europeans. The Chinese irrigated massive river systems(Yellow and Yangtze) and discovered a primitive form of immunization called variolation https://en.m.wikipedia.org/wiki/Variolation
[–] videocodec ago
The dip after the Song Dynasty was from the Mongols.