A U.S federation is a political system in which power is divided between a central government and individual states, allowing both levels of government to operate independently within their own spheres of authority. This division of power is crucial for balancing the interests of both the national and state governments, promoting a system of checks and balances. The U.S federation is designed to ensure that states have the autonomy to govern themselves while still adhering to the overarching laws and policies set by the federal government.