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 of the united states of america. the preceding words are the preamble to the united states constitution. list each of the underlined clauses and then briefly discuss how the united states government today performs each of those functions (i. e. establish justice).