What was the reason for the constitutional convention?

The Constitutional Convention of 1787 met to rewrite the laws
of the U.S. government as they were agreed upon under the Articles Of Confederation. 

The second , larger puritan colony of massachusetts bay was conceived as a "city upon a hill". but it also struggled with internal turmoil like the salem witch trials and external conflicts like king philip's (metacom's) war.

The central idea is that the hiv/aids epidemic is serious.