How did Themistocles convince the Athenians to invest in a naval build up?

Themistocles convinced the Athenians to invest in a naval buildup by emphasizing the threat posed by the growing power of Persia, particularly after the Battle of Marathon. He argued that a strong navy would be crucial for protecting Athens and expanding its influence in the Aegean. By highlighting the economic benefits of trade and maritime power, he gained support from the influential merchant class. His persuasive rhetoric and strategic foresight ultimately led to the allocation of funds from the silver mines at Laurium for the construction of a powerful fleet.