It created a too-weak national government.
When Congress drafted the nation's first constitution in 1777, it knew that many Americans feared a powerful national government. For that reason, the proposed Articles of Confederation created a framework for a loose confederation of states. Within this alliance, each state would retain "sovereignty, freedom, and independence." Any power not specifically given to Congress was reserved for the states. This meant that each state could often develop its own policies.
In addition, the Articles did not set up an executive branch to carry out the laws or a judicial branch to settle legal questions.