The issues or events that highlighted the insufficiency of the power of the central government under the Articles of Confederation include:
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The central government’s inability to impose taxes on states - This was a significant weakness, as the government could not generate revenue to pay debts or fund operations.
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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 respond to civil unrest.
These two options explicitly demonstrate the limitations of the central government's authority under the Articles of Confederation. The other options regarding the laws of Congress and the creation of new laws do not directly highlight the insufficiency of power concerning the inability to enforce tax laws or maintain stability.