The Anti-Federalists were a group of people who opposed the ratification of the United States Constitution. They believed that the Constitution gave too much power to the federal government and that it would lead to a tyranny. The Anti-Federalists also believed that the Constitution did not protect individual rights.
In order to address the concerns of the Anti-Federalists, the Federalists agreed to add a Bill of Rights to the Constitution. The Bill of Rights is the first ten amendments to the Constitution and it protects individual rights such as freedom of speech, freedom of religion, and the right to a fair trial.
The addition of the Bill of Rights helped to convince the Anti-Federalists to support the ratification of the Constitution. The Constitution was ratified in 1788 and the Bill of Rights was added in 1791.