Why did john quincy adams's popularity decline towards the end of his term as president?

Born in braintree (present-day quincy),  massachusetts, on october 30, 1735, john adams was the oldest of john and susanna boylston adams’ three sons. the elder adams was a farmer and shoemaker who also served as a congregationalist deacon and an official in local government

The correct answer is "He was free because he had lived in free states". In Dred Scott v. Sandford, the Supreme Court ruled that Americans of African descent could not sue in federal court. In this case Dred Scott defended himself by stating that he and his family had lived in territory were slavery was banned, and for that reason he considered himself as a free person.