Most ASB event that happened in OTL

2. The City Rome turning in to one of the largest Empire

To be fair, Rome spent 150 years to rule Italy from the Appennines to the tip of Calabria - which may be considered an acceptable pace for the Classical age. It is the chain of events in the next 2 centuries that would be more considered by us more ASB. But it is also ASB how all the Hellenistic Kingdoms made harakiri one after another.
 
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