what is the main feature of a federation
Federation A federation (also known as a federal state) is a political entity characterized by a union of partially self-governing states or regions under a central (federal) government. In a federation, the self-governing status of the component states, as well as the division of power between them and the central government, is typically constitutionally entrenched and may not be altered by a unilateral decision of either party, the states or the federal political body. Alternatively, federation is a form of government in which sovereign power is formally divided between a central authority and a number of constituent regions so that each region retains some degree of control over its internal affairs.[1][2]
Territories of the United States Territories of the United States are sub-national administrative divisions directly overseen by the United States Federal Government. Unlike U.S. states and Native American tribes which exercise limited sovereignty alongside the federal government, territories are without sovereignty.[2] The territories are classified by whether they are incorporated and whether they have an "organized" government through an Organic Act passed by the U.S. Congress.[3]