Final answer:
The national government could not coin money under the Articles of Confederation, leading to the issuance of worthless currency which contributed to economic problems.
Step-by-step explanation:
The national government could not coin money under the Articles of Confederation. This meant that it did not have the power to issue currency or control the monetary system in the young nation. As a result, individual states and state banks issued their own banknotes, which had the same problems as the worthless Continental currency. This lack of a unified national currency contributed to the economic problems faced by the United States at the time.