What is the purpose of the phrase "establish Justice, insure domestic Tranquility, [and] provide for the common defence" in the Constitution's 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. -U.S. Constitution, Preamble U.S. Constitution, Preamble, June 21, 1788, National Archives and Records Administration A. To claim that the new Constitution can be changed over time B. To guarantee that the American people will get to vote on all new laws C. To explain that the U.S. government has a duty to protect its people D. To show that the people hold all political power in the country​