Final answer:
The biggest problem with the Articles of Confederation was its inability to impose taxes, which weakened the national government.
Step-by-step explanation:
The biggest problem with the Articles of Confederation was its inability to impose taxes. Under the Articles, only state governments had the power to levy taxes, which led to a lack of funding for the national government. This limited its ability to pay debts, conduct foreign affairs, and protect American ships from attacks. The inability to impose taxes ultimately weakened the national government and highlighted the need for a stronger federal government.