The U.S. Constitution is the fundamental framework of America's system of government. The Constitution: ... Separates the powers of government into three branches: the legislative branch, which makes the laws; the executive branch, which executes the laws; and the judicial branch, which interprets the laws.
Explanation : The Constitution of the United States established America's national government and fundamental laws, and guaranteed certain basic rights for its citizens. Under America's first governing document, the Articles of Confederation, the national government was weak and states operated like independent countries.