Final answer:
The phrases from the Preamble of the U.S. Constitution refer to improving governmental unity, establishing a fair legal system, maintaining peace within the nation, and contributing to the nation's wellbeing by civic engagement.
Step-by-step explanation:
To form a more perfect union means to improve the functioning and unity of the states under a central government, addressing the shortcomings of the previous Articles of Confederation. The phrase establish justice refers to the creation of a system of laws and courts that is fair and equal for all citizens. To insure domestic tranquility means to maintain peace and order within the country's borders, preventing conflicts and fostering stability. As a citizen, one can promote the general Welfare by engaging in civic duties such as voting, volunteering for community service, or participating in public dialogue, thus contributing to the nation's economic and social prosperity.