What kind of drawbacks of the Articles of Confederation were apparent to the framers of the Constitution and based on the situation then (and now) do you believe it was a necessity to move to a federal system of government where the states rights were subdued?

What kind of drawbacks of the Articles of Confederation were apparent to the framers of the Constitution and based on the situation then (and now) do you believe it was a necessity to move to a federal system of government where the states rights were subdued? Why or why not? Please offer rational evidence in your explanation.