The Articles of Confederation governed the United States from 1781 to 1789, but the national government it established was too weak. In response, the Constitution was drafted in 1787 and ratified in 1788, establishing a stronger federal government with powers shared between national and state authorities. The Constitution guarantees individual rights and is the supreme law of the land. It implemented the principles of popular sovereignty, separation of powers, checks and balances, and representative democracy. Most state governments mirror the national government structure.