The Articles of Confederation are the laws that states each state can have its own government, and they can have their own laws. So that means they didn't have to listen a national government
The Constitution was made 1787. The Constitution is the plan for the United States government. The Constitution has the highest law in the United States. Everyone in the United States must obey these laws. These laws limit power for the government.
The leaders of the Constitutional Convention helped stop the Articles of Confederation because the states were starting to get to much power. The main leaders were James Madison, George Washington, and Alexander Hamilton.