The correct answer to this open question is the following.
What is the purpose of government according to US president Thomas Jefferson, is "to protect the natural rights of the American people and secure life, property, and the pursuit of happiness."
I completely agree with the concept of government stated by Antifederalist US President Thomas Jefferson.
Indeed, when he drafted the Declaration of Independence with the help of other four prominent Americans(Roger Sherman, Benjamin Franklin, Robert Livingston, and John Adams), Jefferson clearly established the foundation of the ideals that would appear in the Preamble of the United States Constitution.
After so much debate and discussion on the part of the delegates who participated in the Constitutional Convention of Philadelphia, Pennsylvania, they agreed on including a Bill of Rights that is the first ten amendments to the US Constitution. Drafted by James Madison, these amendments include the ideas expressed by Thomas Jefferson of liberty and natural rights.
My own views on the purpose of government based on the statement of Thomas Jefferson is that those rights are the reason for our existence as a nation. The federal government and the other forms of government (state and local) have the responsibility -granted by the American citizens- of protecting those rights and liberties, creating peace and economic conditions for every American to thrive.