The answer is popular sovereignty. Popular sovereignty says that all power lies in the hands of the people.
No. At first it wasn't and then slowly they started to realize how bad it was and created laws and etc to protect the working class.
Some believed that the Constitution did not give the new federal government the ability to restrict inherent rights, so no list of those rights was necessary. Others worried that if the rights were listed, they would invariably forget some and the list would ever be incomplete. Finally, the argument was that the states each had their own constitutions, too, and that rights were best protected at a state level.