What the difference between confederation and a unitary system of government?
A unitary government is one in which governmental power is centralized in a national government. All the key powers belong to the national government.
A confederation is a system of government in which states retain ultimate authority except for those powers that are expressly delegated to the central government.
In unitary, centralized or national systems, states are subordinate to the national government and the relationship is hierarchical.
In Confederal systems, states retain sovereign power and national government is dependent on their will.