Preamble of the united states constitution 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. source:which provides the best summary of the preamble's purpose? a) the preamble confirms the responsibilities of leaders of the united states of america. b) the preamble lists the rights and responsibilities of citizens of the united states of america. c) the preamble explains the reasons why the leaders of the united states ordained the constitution as america's guiding legal document. d) the preamble provides the reasons why the framers of the constitution needed the articles of confederation.