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Historically speaking, it is because the asian powers failed to industrialize and adapt to resist European imperial powers (only exception being Japan). Then they got angry about the Europeans (eg India, Vietnam, Indonesia, ~China). Then filthy commies fucked everything up. Only a couple of countries didn't have major psycho-nationalistic revolutions/upheavals. And all had shitloads of children, usually at state request (eg after ww2 there were 5 babies/couple, who then had another 2-3 children before in teh 70s the chinese government went 'O-SHI-!' and fraeked out... resulting in 1-child policy but it is widely flouted by many, many people so there are still >2 children/couple roughly)
Lots of reasons. Main one now is that there are too many people and their governments nearly all suck ass.