Which key flaw most likely encouraged the replacement of the articles of confederation?

There was no national tax system and no straightforward laws of citizens rights. the articles allowed states to tax citizens which only led to an abuse of power. shays rebellion highlighted these problems because when farmers couldn't pay the states high taxes the courts just took land from them. the uprising showed politicians the need for a strong central government that would protects it's citizens (bill of rights) and oversee states rights.

D.successful because there were no legal protections for unions.