Among the functions of the government that the Preamble reffers to, the first one would be to establish justice, through the United States Justice and system.
Insure Domestic Tranquility in the form of a lifestyle that is confortable for all americans and that involves stability.
Provide For The Common Defense by defending american coasts from possible Imperial attacks, based of historic events (British and French invasions).
Promote The General Welfare this is in order to eliminate the danger of starving among the population in time when there is industrial halt and not much economical development.
Secure The Blessings Of Liberty To Ourselves And Our Posterity by protecting the rights of each individual and limiting the powers of the national and state government to ensure true freedom. Another function described related to the constitutional Preamble is defined by the articles concerning legistative, executive and judicial duties.