During the period from the 4th to the early 2nd centuries BC, the political center of gravity in Greece shifted from individual city-states to federal leagues, such as the Aetolian League and the Achaean League. These were confederations that jointly handled the foreign and military affairs for the member cities. Their internal structure was democratic with respect to the member cities, that is, each city within the league had a weight roughly proportional to its size and power. On the other hand, the cities themselves were largely represented in the leagues by their wealthy elites if they had an oligarchic form of government (another common form of government during the late Classical and Hellenistic periods) or by their Tyrant if they had a tyrannical form of government.
