Written in 1787, ratified in 1788, and in operation since 1789, the United States Constitution is the world’s longest surviving written charter of government. Its first three words – “We The People” – affirm that the government of the United States exists to serve its citizens. The supremacy of the people through their elected representatives is recognized in Article I, which creates a Congress consisting of a Senate and a House of Representatives. The positioning of Congress at the beginning of the Constitution affirms its status as the “First Branch” of the federal government.
The Constitution assigned to Congress responsibility for organizing the executive and judicial branches, raising revenue, declaring war, and making all laws necessary for executing these powers. The president is permitted to veto specific legislative acts, but Congress has the authority to override presidential vetoes by two-thirds majorities of both houses. The Constitution also provides that the Senate advise and consent on key executive and judicial appointments and on the approval for ratification of treaties.
For over two centuries the Constitution has remained in force because its framers successfully separated and balanced governmental powers to safeguard the interests of majority rule and minority rights, of liberty and equality, and of the federal and state governments. More a concise statement of national principles than a detailed plan of governmental operation, the Constitution has evolved to meet the changing needs of a modern society profoundly different from the eighteenth-century world in which its creators lived. To date, the Constitution has been amended 27 times, most recently in 1992. The first ten amendments constitute the Bill of Rights.
Whereas the Federal Constitution puts limits the States' power, the States outside of the Union have no such limits. In other words, the State has full control of their people, rather than the people having full control of the State.
Another way to put this is that the Federal Constitution is a blacklist, telling the State what they cannot do, whereas the Constitutions of States outside of the Union are whitelists, telling the People what they can do.
We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defence, promote the general Welfare, and secure the Blessings of Liberty to ourselves and our Posterity, do ordain and establish this Constitution for the United States of America.
The Constitution establishes a process of amendment allow it to change with the times and the needs of the people.
If a State would like to join the Union, it must go through the following process:
"New States may be admitted by the Congress into this Union; but no new State shall be formed or erected within the Jurisdiction of any other State; nor any State be formed by the Junction of two or more States, or Parts of States, without the Consent of the Legislatures of the States concerned as well as of the Congress."