The Bill of Rights made it possible for the Anti-Federalists to support the Constitution because the Anti-Federalist believed that the Bill of Rights will help curtail the over-centralization of the federal government which will in turn support or protect the state and individual rights and liberties. Hence, they clamor for the inclusion of the Bill of Rights into the United States Constitution.
The Bill of Rights was added because both Anti-Federalists and Federalists later agreed that the Bill of Rights served as the common ground between those who favored central power and those who preferred states and individual liberties.
The United States solve Constitution solved the problem of the central government's weaknesses by giving its certain powers/rights.
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