From Newgeography and the idea of "peak megacities" - -
"Until recently the worldwide trend toward megacities — there were 34 in 2014 — has seemed relentless. But in much of the world this trend is slowing down. The populations of Europe and North America are growing slowly, with the exception of London and Moscow. In the last decade the population of New York City grew at roughly one third the relatively low national rate."