The Romans move into Greece and their subsequent treatment of the Greek city states was a prime example of how Machiavelli thought power should be acquired and maintained.
They were brought into Greece by the Aetolians. As Machiavelli stated, when a powerful foreign party enters a country, people that have an existing hatred or grievance with the ruling power are naturally drawn towards this new external challenger.
Despite conquering large amounts of territory, the Romans attempted to appease the majority of the local people and keep down any potential challengers to their power. Several measures were taken by the Romans to ensure that they successfully added the land of several countries to their own region.
Firstly, the Roman senate set up colonies and maintained friendly relations with weaker powers, such as the minor Greek states of the Achaeans and Aetolians, while at the same time ensuring they did not allow any increase in strength of these smaller states.