We the People of the United States, in Order to form a more perfect Union, establish Justice, insure domestic Tranquility, provide for the common defense, 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.

How does the word "insure" help set the tone of the Preamble?

It highlights the Constitution's intention to set laws that establish and keep peace.
It shows the people's desire to help other countries fight for independence.
It gives the government permission to make decisions for the people.
It reveals the power granted to the framers of the Constitution.