Here is a list of problems that took place under the Articles of Confederation:
1) No common currency- Each state had different currency (aka money) making international and interstate trade extremely difficult.
2) Inability to collect taxes- This resulted in the federal government being unable to pay off their debt from the American Revolution.
3) Weak federal government- The federal government could not follow states to follow federal laws.
4) Inability to stop rebellion- The Articles of Confederation made it so that the federal government had so little power that they could not put down rebellions within the US (example= Shay's Rebellion).