Why was Thomas Paine‘s common sense considered radical

While Common Sense is best known as a catalyst of popular support for American independence, the radical ideas it contained had trans-Atlantic sources and impact. Forcefully denouncing British tyranny, Paine drew on a well established radical tradition that dated back to the seventeenth-century English Revolution.

Explanation:

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"a government in which power is divided between state and national levels". federalism is a system of government in which entities such and state and province, share power with the national government.