The correct answer to this open question is the following.
Although there are no options attached, we can say the following.
A weak national government made it more difficult to solve the problems that arose with Britain and Spain because, under the Articles of Confederation, the central government was weak and did not have the power to raise an army.
It was the states which were sovereign and they indeed had the power to collect money through taxation. The states borrowed money from Congress when it needed. That is why the delegates decided to meet at the Constitutional Convention of 1787 in the city of Philadelphia, Pennsylvania, to revise and create the new COnstitution of the United States.