Why was the Bill of Rights a politically necessary addition to the Constitution?

Question

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The Anti-Federalists were opponents of the Constitution who felt that it gave too much power to the federal government and did not protect individual rights. In order to convince these opponents to ratify the Constitution, Federalists promised to add a Bill of Rights to protect individual liberties. Therefore, the Bill of Rights was a politically necessary addition to the Constitution in order to appease the Anti-Federalists and ensure the ratification of the new government.

Why Was the Bill of Rights a Politically Necessary Addition