Section 6 states federal government is the law of the land and Brutus is afraid that the federal government will trample over states' rights.
The federal government of the United States is the common government of the United States, a federal republic in North America, composed of 50 states, a city within a federal district, five major self-governing territories, and several island possessions.
Federal” means that there is both a national government and governments of the 50 states. A “republic” is a form of government in which the people hold power, but elect representatives to exercise that power.
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