The Persian Empire maintained control over its Greek subjects through indirect rule, propping up local strongmen known as 'tyrants.' These rulers were loyal to Persia because the empire was their sole source of power, making them effective but vulnerable puppets against a populace that resented them.

The historical lesson of Thucydides' Trap is misunderstood. The Peloponnesian War was caused by the hegemon, Athens, abusing its allies, leading them to rebel. This parallels current US tensions with its own allies, rather than its conflict with a rising China.

According to Ken Burns, democracy was not the revolution's intention but its consequence. Initially an "elitist program," the leaders realized they needed to enlist the masses to win. This forced them to extend the language of liberty to everyone, which, once spoken, could not be taken back and ultimately applied to all.

Darius portrayed himself as an agent of cosmic truth and order ('Arta'). He branded enemies not just as political opponents but as agents of a universal lie ('Drauga'), turning rebellion into a moral and religious crime that demanded punishment and legitimized his rule.

Widespread suffering alone doesn't trigger a revolution. Historically, successful uprisings require a politically savvy, well-organized group with a clear agenda and influential leadership. Disparate and unorganized populations, no matter how desperate, tend to see their energy dissipate without causing systemic change.

Historical revolutions, like Iran's in 1979, are not clear-cut events with a predetermined winner. For years, they exist in a state of flux with multiple factions competing for control. The eventual outcome is only obvious in hindsight, not to those living through the uncertainty.

The Shah was seen as a repressive autocrat, yet he was indecisive when confronted with mass protests, partly due to his illness. This politically toxic combination alienated the people through repression while emboldening them through weakness, creating the perfect conditions for his downfall.

The sacking of the Persian city of Sardis by the Athenians was a shocking affront to King Darius, the world's most powerful man. This act of aggression by a little-known group created an insult so profound that a massive military response became politically necessary to maintain credibility.

History shows a recurring cycle in revolutions where the activists and idealists who help destabilize a country—so-called 'useful idiots'—are often the first to be killed by the new autocratic regime they usher in. This pattern was seen in Russia, Iran, and with the French Revolution.