Final answer:
The event that served as evidence of the Articles of Confederation's inadequacy was Shays' Rebellion in Massachusetts in 1787.
Step-by-step explanation:
The event that took place in Massachusetts in 1787 that served as evidence that the Articles of Confederation were no longer suited to serve as an effective governing document for the United States was Shays' Rebellion.
Shays' Rebellion was an uprising led by Daniel Shays, a former Revolutionary War captain, against high taxes and economic policies that were causing financial hardship for farmers in Massachusetts.
The rebellion exposed the weaknesses of the Articles of Confederation, as the federal government was unable to effectively suppress the rebellion and provide a solution to the grievances of the farmers.
Learn more about Shays' Rebellion