Answer:
The national government could not tax citizens directly, only request money from the states. The states rarely contributed money, meaning the national government could not pay its debts or fund initiatives.
The national government could not regulate international or interstate trade. The national government could not stop states from undermining it by making their own trade agreements with foreign nations.
The national government could not raise an army, only request that the states send soldiers. States could refuse to send soldiers, making it difficult to defend the nation.
Each state only had one vote in Congress, regardless of its population. The citizens of small states had proportionally more political power than the citizens of large states.
The national government had no executive branch. The national government had no way of implementing or enforcing its legislative decisions.
The national government had no judicial branch. There was no effective way to resolve disputes between states, such as competing claims to the same territory.
Passing laws required the approval of nine states, and amending the Articles required the approval of all thirteen states. It was difficult to get enough consensus to make laws and nearly impossible to fix the Articles themselves.
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