The reasons why the Constitution is necessary are outlined in the Preamble of the United States Constitution. The Preamble begins with the famous phrase, "We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defense, 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." It sets out the key purposes and objectives of the Constitution.
