Upon meeting together at the constitutional convention in 1787, the founding fathers were exceptionally prepared to craft a durable and sustainable democratic republic because:

It is on the grounds that the law based standards had created in the American states over the past 170 years. 
In September 1786, at the Annapolis Convention, delegates from five states required a Constitutional Convention keeping in mind the end goal to talk about conceivable enhancements to the Articles of Confederation. The Constitutional Convention occurred in Philadelphia on May 14, 1787.