A slightly different set of chemicals in the primordial soup that started us off.
The asteroid that wiped out the dinosaurs hitting slightly harder and wiping out a lot more life.
One of the successful empires being a bit more successful and then taking everyone down with them.
A virus being slightly more resistant to the level of medical knowledge we had relative to the time.
Certain scientists cracking certain weapons earlier.
Any number of judgement calls involving nukes.
Humanity has been so close to death so many times over the years.
You honestly think everyone else is equally lucky?
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