Law of the land
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.
This statement is the preamble to the Constitution of the United States. This document is the core for all laws in the nation.
The Constitution of the United States is an agreement between its citizens that establishes the branches of government, their duties, and restrictions.
Since its initial ratification by the states, there have been twenty-seven amendments to the Constitution.