As the historian Greg O'Brien has noted, the Choctaw developed three distinct political and geographic regions, which during the colonial period sometimes had differing alliances with trading partners among the French, Spanish and English. They also expressed differences during and after the American Revolutionary War. Their divisions were roughly eastern, western (near present-day Vicksburg, Mississippi) and southern (Six Towns). Each division was headed by a principal chief, and subordinate chiefs led each of the towns within the area. All the chiefs would meet on a National Council, but the society was highly decentralized for some time.