As Fernand Braudel said, populations in Europe, China and and North America seems to roughly mirror one another for most of the last 5,000 years. The only possi

As Fernand Braudel said, populations in Europe, China and and North America seems to roughly mirror one another for most of the last 5,000 years. The only possible explanation is the climate. Some centuries were good in the northern hemisphere, and some were bad. Not all at once, and not uniformly, but enough that we can see some link.