In order to deal with the acute problem of unifying diverse conquered regions into a single kingdom, Philip II resorted to a series of new measures. Thrace was governed as an external province under a Macedonian military governor. By relocating populations from the annexed territories to Macedonia and Macedonians to newly conquered regions, he managed to incorporate the previously autonomous cities to his realm, and to merge their population into one nation.
In general, Philip adopted the institutions of the Thessalian and Chalkidian Leagues. He subdivided Macedonia proper into civic districts, which also served as recruiting areas, and set up constitutional authorities to govern them. He also divided the whole kingdom into four administrative districts and reinforced the king's position to a considerable degree.