The delegates at the Constitutional Convention met to revise the Articles of Confederation.
The Articles of Confederation was America's first constitution used after becoming independent from Great Britain. This constitution, however, was highly ineffective. This is due to the fact that there was no executive branch (aka no president), Congress did not have the ability to collect taxes, the state's did not have to follow national laws, etc. All of these factors resulted in a highly ineffective government that needed to be revised. This is why the delegates meet at the Constitutional Convention.
After much debate and attempts to change the Articles of Confederation, the delegates decided to start over new and develop a completely new US Constitution. This resulted in the current US Constitution we still use today.
