Editor says, what if the Greeks had won the Battle of Sardinia Sea? Please note that the opinions expressed in this post do not necessarily reflect the views of the author(s).
In our timeline this battle is generally considered to mark the end of Greek colonization in the Western Mediterranean. Massillia is the modern day French town of Marseilles.
Editor says, in reality Corsica passed into Etruscan hands, while Carthage retained Sardinia. Carthage would fight two more major naval battles with Massalia, losing both but still managing to close the Strait of Gibraltar to Greek shipping and thus containing the Greek expansion in Spain by 480 BC. Attempts by Etruscans to conquer Greek areas in Southern Italy would be opposed by the Greek city of Cumae. They would defeat an Etruscan invasion in 524 BC. Carthage would defeat the attempt of Spartan prince Dorieus to colonize North Africa (c513 BC) and Western Sicily c510 BC. While Carthage was busy in Sardinia after 509 BC dealing with a native uprising, the Greek city of Syracuse under Gelon, allied with the Greek city of Agrigentum under Theron to jointly challenge the Carthaginians in Sicily. This set the stage for the Sicilian Wars (480 - 307 BC) between Carthage and the Greeks.
According to Herodotus, it was only after the battle that Phocaeans moved to Italy where they founded Elea.
Some authors consider that the Greek defeat and consequent lack of Greek traders in the Gibraltar Strait led to the collapse of the Tartessian civilization in Southern Spain, while the Punic presence remained undisturbed.
In this article we explore an idea raised on the Straight Dope bulletin board, repurposing content from Wikipedia. Editorial comments are entered in [light green] typeface.