Which principle was added to the US Constitution in order to convince opponents to support ratification?

The principle of the Bill of Rights was added to the U.S. Constitution to address the concerns of opponents regarding individual liberties and limitations on government power. This first ten amendments were ratified in 1791 and guaranteed fundamental rights such as freedom of speech, religion, and the right to bear arms. Their inclusion helped secure the necessary support for ratification by reassuring skeptics that their personal freedoms would be protected.