alternatehistory.com

Hi

I was wondering: what would define a certain phenomena as an ASB?

For example, let take one of the favorite periods for alternate timelines: the Second World War.

Supposed that - in the middle of 1941, for example - there is a pandemic of Spanish/Asian-like flu? Such outbreak would an ASB? Or an outbreak of Ebola-like virus?

Would be an ASB if a meteor shower destroyed an important town in period, or a Tungunka-like Event?
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