(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 popular sovereignty refers to the principle that the governments rule and derive their power from the consent of the people that are governed. In other words that the governments are of the people for the people. This passage reflects that idea as it is the people of the United States that established the constitution.
Approximately 620,000 soldiers died from combat, accident, starvation, and disease during the Civil War.
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There have been a total of 45 presidents so far in The United States.
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The answer to this question is Cold War