A sovereign state is one having a permanent population, defined territory, one government, and the capacity to enter into relations with other sovereign states. It is also normally understood that a sovereign state is neither dependent on nor subjected to any other power or state. Four essential features: Population, Territory, Sovereignty, and Government
A federal system of government is a union of partially self-governing states or regions under a central government with powers usually assigned to each by a constitution. Neither the states nor the federal body acting alone can change the constitution.