Final answer:
The inability of the Articles of Confederation to grant tax powers to the national government resulted in a lack of funding, which impeded debt repayment, defense, foreign relations, and economic stability.
Step-by-step explanation:
One of the main flaws of the Articles of Confederation was the inability to tax, and this was a problem because it meant the national government could not generate revenue directly. States were required to contribute funds, but often failed to do so, leading to an underfunded central government. This lack of funding compromised the government's ability to pay debts from the Revolutionary War, conduct foreign affairs effectively, and guarantee economic stability. The lack of financial resources also hindered the government's ability to raise an army, leaving the nation vulnerable to external threats and internal unrest, such as Shays's Rebellion. Moreover, the inability to manage the economy led to issues with currency depreciation, undermining trust in the national currency.