Historical source: National Archives, Constitution of the United States: A Transcription. Original wording is distinguished from explanatory notes below.
The Preamble introduces the Constitution and states the purposes for which the people established the federal government.
Original text of the Preamble
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.
What it means
The Preamble sets out six broad goals: a stronger union, justice, domestic peace, common defense, general welfare, and liberty for present and future generations. It introduces the Constitution but does not itself enumerate the government’s powers.
Primary source: Read the Constitution at the National Archives.