Federalism a political system in which a strong central authority shares power with the state or regional governments. Sharing of power at multiple levels is the main characteristic of it. While in unitary government all the political power is controlled by the central government.
<em><u>Sharing of power in federalism systems makes it more complex than unitary government.</u></em>
United states, India and Canada have federal governments, Australia and Germany have unitary form of government.
Separation of powers, dual government, written and rigid constitution, separation of powers, independent judiciary and supremacy of constitution are some salient features of federal government.
This is Thomas Jefferson, who was a Republican leader when the party system took hold. He went on to become president of the United States and considered Alexander Hamilton to be a political rival.