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What if the Carthaginians won the first Punic war ending in the sacking of Rome. Would the Carthaginians have expanded to the same extent as Rome would OTL.
The POD is that Rome just stayed with normal ship tactics and didn't use the Corvus [Spiked bridge to allow roman troops to be used in battle in proper formation].
Then the experienced Carthaginian navy routed the Roman Navy in battle and kept control of the sea. They raided the roman coast and stopped the romans from resupplying their armies.
They landed and destroyed Rome thought they took considerable casualties against the Roman legions. They slowly then took the rest of the Roman territory.