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. –the constitution of the united states of america based on the passage, what is the purpose of the constitution? to protect each citizen's right to freedom of speech to end the practice of slavery in the united states to create a fair and stable system of government