The importance of Popular Sovereignty in the Constitution?

Don’t expect anyone here to do your homework for you.

popular sovereignty – Originally, any form of government not headed by an hereditary monarch. In modern American usage, the term usually refers more specifically to a form of government in which ultimate political power is theoretically vested in the people but in which popular control is exercised only intermittently and indirectly through the popular election of government officials and/or delegates to a legislative assembly rather than directly through frequent mass assemblies or legislation by referendum.

From: http://teecher.sduhsd.k12.ca.us/mmontgomery/american_govt/ch_notes/terms/ch2_terms.htm

But don’t trust me.

@Blobman Can you please define “popular sovereignty”?

I am asking no one to do my homework for me. Getting others’ opinions is part of my homework.
@Yetanotheruser Popular sovereignty, in short, is when the power for something, a government in this case, comes from the people or the people or its people.

Power to the People

I think asking for opinions in relation to homework is a valid use of Fluther!

@Blobman I had my own understanding of the term, I just wanted to see how it compared with your definition.

My answer:
Putting it simply, the colonists saw the hereditary monarchy, and indeed of any system of government which would govern from the top down, as system that was built on injustice.

The Constitution of the US is based on the concept of popular sovereignty, and without that concept it would have turned out radically different, either as drawn up or as it evolved.