Answer:
Taxes and debts.
Step-by-step explanation:
By the year 1786, the U.S. was undergoing a severe financial crisis, and states were struggling over matters of borderlines and taxes. The financial crisis led not only the states but also to the common citizens in debts. Outraged farmers in Massachusetts started a rebellion recognized as Shay's rebellion. Though the Massachusetts force succeeded to control the rebellion, the rebellion pointed out the vulnerability of the central government to sustain law and order.