How many states are needed to pass an amendment to the Articles of Confederation?

Unlike the current Constitution, all thirteen states had to approve the Articles before it would be in effect. A number of years elapsed between the approval of the draft of the Articles of Confederation by the Continental Congress in late 1777 and the ratification by the final state in 1781

Unlike the current Constitution, all thirteen states had to approve the Articles before it would be in effect. A number of years elapsed between the approval of the draft of the Articles of Confederation by the Continental Congress in late 1777 and the ratification by the final state in 1781