What was added to the Constitution two years after it was ratified? Why?

Ten of those amendments, known as the Bill of Rights, were ratified on December 15, 1791.  The Constitution was not ratified by all states until May 29, 1790, when Rhode Island finally approved the document, and the Bill of Rights was not ratified to become part of the Constitution until the end of the following year.

Explanation:If its not right then oofies =,= and your welcome