failure to regulate trade among the states. Also a failure to regulate taxation from the states. Congress had few effective means to enforce its laws, raise revenue, or regulate the economy.
The Articles of Confederation failed because they did not give Congress and the national government enough power. The new United States just fought a war to end what they considered tyrannical rule of a strong government that overpowered local government and the leaders of the U.S. feared a powerful central government.