What were the chief weaknesses of the Articles of Confederation? How did the new constitution seek to solve?

these weaknesses?
This is for an essay, so I need help with info, set-up, or anything else.

Weaknesses:

1) Under the Articles there was only a unicameral legislature so that there was no separation of powers. 2) The central government under the Articles was too weak since the majority of the power rested with the states. 3) Congress, under the Articles, did not have the power to tax which meant that they could never put their finances in order. 4) In order to change or amend the Articles, unanimous approval of the states was required which essentially meant that changes to the Articles were impossible. 5) For any major laws to pass they had to be approved by 9 or the 13 states which proved difficult to do so that even the normal business of running a government was difficult. 6) Under the Articles, Congress did not have the power to regulate commerce which will cause competition between states as well as diplomatic issues,