The two issues or events that highlighted the insufficiency of the power of the central government under the Articles of Confederation are:
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The central government’s inability to impose taxes on states - This limitation meant that the federal government could not generate revenue to pay debts, fund services, or support a national army.
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The rebellion of farmers in Massachusetts due to an increase in taxes - This event, known as Shays' Rebellion, illustrated how the government could not maintain public order or respond effectively to civil unrest, highlighting the weaknesses of the Articles of Confederation.
These two points exemplify the challenges faced by the central government under the Articles and the need for a stronger federal framework, which ultimately led to the drafting of the U.S. Constitution.