Read this excerpt from the preamble to the united states constitution: united states. preamble and first amendment to the united states constitution. (1787, 1791) 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 of the united states of america. how did the voting rights acts of 1869, 1920, and 1971 expand the "blessings of liberty" to more of the united states' population? write a short essay to explain your answer.