Which type of government would state or provincial governments have the most sovereignty most sovereignty?

State or provincial governments have the most sovereignty in a federal system of government, where power is constitutionally divided between a central authority and regional entities. In such systems, states or provinces have the authority to legislate, govern, and manage local affairs independently, as long as they do not conflict with Federal Laws. Examples of countries with this type of government include the United States, Canada, and Australia, where state or provincial governments possess significant autonomy.