The Constitution was written to achieve six goals, which are outlined in the Preamble to the document. In creating a new government, the Framers of the Constitution drew on seven major principles. Those principles - popular sovereignty, republicanism, limited government, federalism, separation of powers, checks and balances, and individual rights- underlie the many provisions of this fundamental law of the land. The Constitution remains a living document, altered by amendments and by the use of implied powers. The federal government has three branches, each of which has a particular role and certain powers and responsibilities. Citizens have rights, duties, and responsibilities as well. By exercising their rights and meeting their responsibilities, they help keep the government strong.