Answer:
The framers of the Constitution would have argued that keeping the list of individual states was important in order to show that the Constitution was a document that was created by the states and for the states. They would have also argued that replacing the list of states with "the United States" would have been more accurate, since the Constitution was created for the people of the United States, not just for the states.
The later draft of the Preamble lists "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" because these were the goals that the framers of the Constitution wanted to achieve with the Constitution. They wanted to create a more perfect union, establish justice, insure domestic tranquility, provide for the common defence, promote the general welfare, and secure the blessings of liberty for all Americans.
One example of how the government carries out one of the goals stated in the final version of the Preamble is by providing for the common defence. The government does this by maintaining a military and by providing for the security of the United States.