Six Purposes of the US Constitution Preamble

1. In order to form a more perfect union,
• better than the articles of confederation
• more perfect than before
2. Establish justice,
• legislature at federal, state, and local levels
• courts at federal, state, and local levels
• law enforcement at federal, state, and local levels
3. Insure domestic tranquility,
• peace between states, counties, and cities
4. Provide for the common defense, 
• national military (army, navy, air force, marines, coast guard)
5. Promote the general welfare, and
• social programs to help elderly and needy individuals
6. Secure the blessings of liberty to ourselves and our posterity,
• maintain civil rights (including voting) for ourselves and our children