[Lucius Cornelius Sulla]

‘Perhaps the increasing cold leading to the last glacial maximum (~18000 years ago) had some adverse effects on the population.’

Not likely, IMHO. Neanderthals had survived several glacial minimums over their history, and disappeared likely after the last glacial minimum.

[meadsjn]

Not likely, IMHO. Neanderthals had survived several glacial minimums over their history, and disappeared likely after the last glacial minimum.

Then perhaps they elected a commie/muslim as a president.

That's likely a one-shot mistake for a population.