Federalism?

Federalism is a system of government in which power is divided between a central authority and constituent political units, such as states or provinces. In a federal system, both levels of government have their own areas of authority and responsibility, and they must work together to govern the country or region. This system is often used in large countries with diverse populations, as it allows for local autonomy while still maintaining a unified national government. Examples of federal countries include the United States, Canada, and Germany.