The correct answer to this open question is the following.
The Bill of Rights made it possible for the Anti-Federalists to support the Constitution because the antifederalists did not support the idea of having a strong central government for the United States, as was the intention of Federalists politicians such as Jhon Jay, James Madison, or Alexander Hamilton. The Bill of Rights was added when James Madison drafted it and solve the issue that confronted federalists vs. antifederalists. It solved the problem so the antifederalists could accept and sign the new Constitution of the US, adding certain rights and liberties for the American people.