It was difficult for the states to trade with each other. If the states used the same kind of money, it would encourage more trading between them which is easier than making their own money. Another weakness was that John Jay mentions that the new government would be fair and enough. Thereby, the people were saying that the weakness of the old government which was the Articles of Confederation was unorganized and not fair. It had no federal court system, so each state made up their own laws and had their wn courts which may have led to a corruption.
One weakness that remained In the Constitution even when It was passed was that Thomas Jefferson mentions that the only important thing that was not in the Constitution was a Bill of Rights. So, the federalists promised to include a Bill of Rights In the constltuuon once It will pass. The Bill of Right were the first 10 amendments, which included the freedom of religion, freedom of press, freedom of speech, freedom of assembly, etc… Another weakness was that the Articles of Confederation had only one house of overnment, but the Constitution provides for fair representation in the government.