The reason for writing the constitution was explained in the Preamble, “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.” 1It is essential because it is the symbol and foundation of protecting our God-given freedoms and setting up ultimately the law of the land; it also set up the three branches of government to protect the freedoms by defining their roles in the check and balances. The Constitution handles contributingmany things to our way of life. Three principles are significantly in the center of the document: Federalism, Separation of Powers, and the Rule of the law.Three principles of Federalism, Separation of Powers, and the Rule of the law are the main principles in the US Constitution. They define the relationship between the federal and stategovernments and to each other. Federalism is the first principle of the US Constitution. Framers saw a weak union under the Articles that was a weak government. Federalism is merely the division of powers between national and state level of government developed from necessity because of the environment in the United States in 1787. States wanted a stable central government on a national level to protect the smaller states. Federalism gave the states power to handle their affairs while fulfilling obligations to the national government. Each of them had their very own constitutions and laws to follow. The Constitution sets up national government obligations states. Article IV requires the federal government to “guarantee a republican form of government to every State, to protect the States against invasion, and, upon request, to protect them against domestic violence.” 2The Constitution places other obligations on the Federal 1The U.S. National Archives and Records Administration. National Archives. June 16, 2017.