What process is described in the excerpt?
For the Athenians were exacting and oppressive, using coercive measures toward men who were neither willing nor accustomed to work hard. And for various reasons they soon began to prove less agreeable leaders than at first. They no longer fought upon an equality with the rest of the confederates, and they had no difficulty in reducing them when they revolted. Now the allies brought all this upon themselves; for the majority of them disliked military service and absence from home, and so they agreed to contribute a regular sum of money instead of ships. Whereby the Athenian navy was proportionately increased, while they themselves were always untrained and unprepared for war when they revolted.
—from Thucydides Translated Into English with Introduction, Marginal Analysis, and Index, Andrew Preston Peabody, 1883