The Shay rebellion needed a strong national government because a coordinated response was needed and states could not offer this.
When the Shay's Rebellion broke out, the federal government was unable to end it quickly because they did not have the money to raise an army that would put and end to the rebellion.
This was because the national government could not raise taxes on its own and had to rely on the financial remittances given to it by the states which could simply decide to give nothing.
In the end, the Massachusetts State militia with the help of a local militia that was privately funded had to put down the rebellion before the rebels laid their hands on federal weapons.
This showed that a strong national government was needed which could call upon its own forces to deal with rebellions.
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