Why do so many invasions come from Central Eurasia? The Mongols, the Huns, the Magyars, the Caucasians? They just seem to go nuts from time to time. Is it because a continental climate changes so often?
It’s the geography in large part — North America has the Great Plains running from north to south, Asia has the steppe running from east to west. And during the 100% natural climate cycle, there’s better conditions for at least a few hundred years, then a rapid falloff, producing pulses of immigration outward to the east, west, and south.
Early “Snowbirds”...