Here is a series of lectures given by Sean Gabb in 2022, in which he discusses the influence of the Greeks on the other peoples of the Ancient World. For reasons of politeness and data protection, all student contributions have been removed.
This third lecture in the course explains specific events and the complex pattern of their existing relationships that brought the Greeks and Persians into conflict. It runs from the Ionian Revolt, though the successful attempt to involve the Athenians, to the failed Persian attempt to crush the Athenians. As ever, it relies heavily on Herodotus.