What's the most historically important natural disaster

Probably the Black Death.

Whatever made the sea peoples fuck up the mesopotamians.

>>2658712
Unification of Germany.

File: 1491073092355.png (590KB, 704x852px) Image search: [Google]

590KB, 704x852px

>>2658726

>>2658712
The typhus breakout that unfortunately killed millions of slavs, gypsies and jewish people in their internment camps.

Those volcanoes that exploded in the pacific during the 1800s were pretty significant.

Also, diseases etc.

Plague of Justinian

>>2658753
Pretty much this and the Antonine Plague for the way they weakened the Romans militarily such that they had no real manpower to fight against invading barbarians (the Germanic tribes post-Antonine, the Lombards and Muslims post-Justinian) which helped percipitate the declines of the western and eastern empire.

And the Black Death of course.

the sinking of atlantis prolonged the amount of time it took for the old world to make contact with the new world

File: atra-hasis.jpg (67KB, 700x382px) Image search: [Google]

67KB, 700x382px

The Flood

>>2658712
I'd say toba supervolcano eruption, it killed the last vestiges of homo erectus, severely fucked the neanderthals and almost drove homo sapiens to the brink of extinction. The supervolcano created a major genetic bottleneck which can still be seen to this day, and ultimately likely drove the necessity for further exploitation of resources (abstract thinking) and likely played a factor in forcing h.sapiens to cross the red sea.

That dinosaur astroite. Or maybe the moon spinning off of earth

The destruction of lemuria and sinking of atlantis.