What was the name of the alliance formed by Athens because of the Persian War?

It was an anti-Persian league, which in modern parlance has been called the Delian League because it started by having its treasury in the island of Delos. As Athens progressively turned this league into an empire, and the Persian threat abated with a peace treaty in 449 BCE, Athens migrated the treasury to its Acropolis, where it was more conveniently available to squander on beautifying the city and paying for half the population in its public service.