When the 13 United States of America declared independence from the United Kingdom in 1776, the founders were attempting to break free from the tyranny of Britains top-down centralized government.

But the first constitution the founders created, the Articles of Confederation, vested almost all power in individual state legislatures and practically nothing in the national government. The resultpolitical chaos and crippling debtalmost sunk the fledgling nation before it left the harbor.

So the founders met again in Philadelphia in 1787 and drafted a new Constitution grounded in a novel separation of state and national powers known as federalism. While the word itself doesnt appear anywhere in the Constitution, federalism became the guiding principle to safeguard Americans against King George III-style tyranny while providing a check against rogue states.

READ MORE: How the United States Constitution Came to Be

The Articles of Confederation.

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The Articles of Confederation were written and ratified while the Revolutionary War was still raging. The document is less of a unifying constitution than a loose pact between 13 sovereign states intending to enter into a firm league of friendship. Absent from the Articles of Confederation were the Executive or Judicial branches, and the national congress had only the power to declare war and sign treaties, but no authority to directly levy taxes.

As a result, the newly independent United States was buried in debt by 1786 and unable to pay the long-overdue wages of Revolutionary soldiers. The U.S. economy sunk into a deep depression and struggling citizens lost their farms and homes. In Massachusetts, angry farmers joined Shays Rebellion to seize courthouses and block foreclosures, and a toothless congress was powerless to put it down.

George Washington, temporarily retired from government service, lamented to John Jay, What a triumph for the advocates of despotism to find that we are incapable of governing ourselves, and that systems founded on the basis of equal liberty are merely ideal & fallacious!

Alexander Hamilton called for a new Constitutional Convention in Philadelphia in 1787 where the Articles of Confederation were ultimately thrown out in favor of an entirely new form of government.

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When the United States cut ties with Britain, the founders wanted nothing to do with the British form of government known as unitary. Under a unitary regime, all power originates from a centralized national government (Parliament) and is delegated to local governments. Thats still the way the government operates in the UK.

Instead, the founders initially chose the opposite form of government, a confederation. In a confederation, all power originates at the local level in the individual states and is only delegated to a weak central government at the states discretion.

When the founders met in Philadelphia, it was clear that a confederation wasnt enough to hold the young nation together. States were scuffling over borders and minting their own money. Massachusetts had to hire its own army to put down Shays Rebellion.

The solution was to find a middle way, a blueprint of government in which the powers were shared and balanced between the states and national interests. That compromise, woven into the Constitution and the Bill of Rights, became known as federalism.

The Constitution and the Bill of Rights created two different kinds of separation of powers, both designed to act as critical checks and balances.

The first and best-known of the separation of powers is between the three branches of government: Executive, Legislative and the Judiciary. If the president acts against the best interests of the country, he or she can be impeached by Congress. If Congress passes an unjust law, the president can veto it. And if any law or public institution infringes on the constitutional rights of the people, the Supreme Court can remedy it.

READ MORE: How Many U.S. Presidents Have Faced Impeachment?

But the second type of separation of powers is equally important, the granting of separate powers to the federal and state governments. Under the Constitution, the state legislatures retain much of their sovereignty to pass laws as they see fit, but the federal government also has the power to intervene when it suits the national interest. And under the supremacy clause found in Article IV, federal laws and statutes supersede state law.

Federalism, or the separation of powers between the state and federal government, was entirely new when the founders baked it into the Constitution. And while it functions as an important check, its also been a continual source of contention between the two levels of government. In the final run-up to the Civil War, the Southern states seceded from the Union in part because of the federal government was unconstitutionally encroaching on their domestic institutions of slavery.

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According to James Madison, a committed federalist, the Constitution maintains the sovereignty of states by enumerating very few express powers to the federal government, while [t]hose which are to remain in the State governments are numerous and indefinite.

Article I Section 8 contains a list of all of the enumerated powers that are exclusively delegated to the federal government. Those include the power to declare war, maintain armed forces, regulate commerce, coin money and establish a Post Office.

But that very same Section 8 also includes the so-called Elastic Clause that authorizes Congress to write and pass any laws that are necessary and proper to carry out its enumerated powers. These powers are known collectively as implied powers and have been used by Congress to create a national bank, to collect a federal income tax, to institute the draft, to pass gun control laws and to set a federal minimum wage, among others.

Other than that, the Constitution grants almost all other power and authority to the individual states, as Madison said. While the Constitution doesnt explicitly list the powers retained by the states, the founders included a catch-all in the 10th Amendment, ratified in 1791:

The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people.

Those so-called reserved powers include all authority and functions of local and state governments, policing, education, the regulation of trade within a state, the running of elections and many more.

In the United States, federalism has proven a successful experiment in shared governance since 1787 and provided the model for similar federalist systems in Australia, Canada, India, Germany and several other nations.

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When the Founding Fathers Settled States' vs. Federal RightsAnd Saved the Nation - History