There were several main factors leading to the Constitutional Convention: The first was Shays's Rebellion, where a farmer led some 1500 men to as an act of retalliation against the state for imposing debts.
The next was the Annapolis convention, where people schemed on what they would do to stop the nation frpom collapsing. Many pushed for reform of the Articles..
What Are We Gonna Do?
Which led to the Consitutional Convention! There, delegates from all the states discussed reforms. People like Ben Franklin, George Washington and Alexander Hamilton were in attendance.