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 rebellion of farmers in Massachusetts due to an increase in taxes - This refers to Shays' Rebellion, which demonstrated the inability of the central government to maintain order and address economic distress.
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The central government’s inability to impose taxes on states - The lack of power to levy taxes was a significant weakness of the Articles, as it prevented the government from raising revenue to pay debts or fund essential services.