The Articles of Confederation had several weaknesses. Which weakness was demonstrated by the failure to help stop Shays's Rebellion? There was no judicial branch.
Congress could not raise an army.
Amendments required unanimous consent.
Each state printed its own money.

So the answer is Congress could not raise an army.

Explanation:

Shay's rebellion exposed the weaknesses of the articles of confederation by exposing that the government, Congress, could not form a military or draft because the federal government did not have money due to the fact that they did not have the ability to enforce taxes upon the citizens.

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