The following issues and events highlighted the insufficiency of the power of the central government under the Articles of Confederation:
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The rebellion of farmers in Massachusetts due to an increase in taxes (Shays' Rebellion) - This event demonstrated the inability of the federal government to maintain order and respond to domestic unrest, which was partly due to its weak authority under the Articles.
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The central government's inability to impose taxes on states - The Articles of Confederation did not grant the federal government the power to levy taxes directly on citizens or states, which severely limited its ability to raise revenue and fund essential functions, such as military defense and debt repayment.
The laws congress created relative to the northwest territory do not necessarily highlight the insufficiency of central government power, as they were a response to the government's need to establish control over new territories rather than a direct example of the weaknesses of the Articles. However, the overall challenges in governance and enforcement could be implied through this aspect as well. Thus, the key issues explicitly underscoring the insufficiencies of the Articles are the rebellion and the taxation power.