Which of the following is not a principle of the US Constitution? Is it separation of powers or is it popular SOVEREGNTY? Or is it tranquility or is it checks and balances?

The principle that is not part of the US Constitution is "tranquility". The correct principles of the US Constitution are separation of powers, popular sovereignty, and checks and balances.

The principle of the US Constitution that is not listed among the options you provided is tranquility. The correct answer is tranquility. The other three principles, separation of powers, popular sovereignty, and checks and balances, are all key principles of the US Constitution.

To determine which of the options is not a principle of the US Constitution, we can consider the content and meaning of each term.

1. Separation of powers: This principle refers to the division of governmental powers among three branches: the executive, legislative, and judicial. Each branch has distinct responsibilities and abilities to check and balance the others.

2. Popular sovereignty: This principle holds that the ultimate source of political power resides with the people. It means that the government's authority and legitimacy depend on the consent of the governed.

3. Tranquility: Tranquility, in the context of the US Constitution, does not represent a principle. It is one of the goals mentioned in the Preamble, which seeks to establish "a more perfect Union, establish justice, insure domestic tranquility..."

4. Checks and balances: This principle refers to the system of controls that each branch of government has over the others, ensuring no branch accumulates excessive power. It helps maintain a balance of power and prevents abuses.

Considering these explanations, we can conclude that tranquility is not a principle of the US Constitution.