Answer: The citizens of the United States are forming a new nation. In this union, we will promise justice and ensure that there will be calmness throughout the land. We will help and support the military and other defenses, we will help everyone to have what they need to survive. We will support and defend the blessing of liberty to our modern citizens and the future. The citizens of the United States of America establish this constitution.
Explanation: Restating the preamble is like breaking down the phrases. Take it one step at a time, find synonyms that you can use to make a new, modern sentence. "Posterity" means the same as "future" so therefore, you know you are talking about the future of the country.