The two issues 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 lack of authority made it difficult for the government to raise revenue and meet its financial obligations.
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The rebellion of farmers in Massachusetts due to an increase in taxes - This refers to Shays' Rebellion, which exposed the weaknesses of the federal government in dealing with civil unrest and highlighted the inability to maintain order or provide for the common good under the current framework.
These events underscored the limitations of the Articles of Confederation and prompted calls for a stronger central government.