The system of checks and balances in government was developed to ensure that no one branch of government would become too powerful. The framers of the U.S. Constitution built a system that divides power between the three branches of the U.S. government—legislative, executive and judicial—and includes various limits and controls on the powers of each branch.

Separation of Powers

The idea that a just and fair government must divide power between various branches did not originate at the Constitutional Convention, but has deep philosophical and historical roots.

In his analysis of the government of Ancient Rome, the Greek statesman and historian Polybius identified it as a “mixed” regime with three branches: monarchy (the consul, or chief magistrate), aristocracy (the Senate) and democracy (the people). These concepts greatly influenced later ideas about separation of powers being crucial to a well-functioning government.

Centuries later, the Enlightenment philosopher Baron de Montesquieu wrote of despotism as the primary threat in any government. In his famous work “The Spirit of the Laws,” Montesquieu argued that the best way to prevent this was through a separation of powers, in which different bodies of government exercised legislative, executive and judicial power, with all these bodies subject to the rule of law.

The U.S. System of Checks and Balances

Building on the ideas of Polybius, Montesquieu, William Blackstone, John Locke and other philosophers and political scientists over the centuries, the framers of the U.S. Constitution divided the powers and responsibilities of the new federal government among three branches: the legislative branch, the executive branch and the judicial branch.

In addition to this separation of powers, the framers built a system of checks and balances designed to guard against tyranny by ensuring that no branch would grab too much power.

“If men were angels, no government would be necessary,” James Madison wrote in the Federalist Papers, of the necessity for checks and balances. “In framing a government which is to be administered by men over men, the great difficulty is this: You must first enable the government to control the governed; and in the next place, oblige it to control itself.”

Checks and Balances Examples

Checks and balances operate throughout the U.S. government, as each branch exercises certain powers that can be checked by the powers given to the other two branches.

  • The president (head of the executive branch) serves as commander in chief of the military forces, but Congress (legislative branch) appropriates funds for the military and votes to declare war. In addition, the Senate must ratify any peace treaties.
  • Congress has the power of the purse, as it controls the money used to fund any executive actions.
  • The president nominates federal officials, but the Senate confirms those nominations.
  • Within the legislative branch, each house of Congress serves as a check on possible abuses of power by the other. Both the House of Representatives and the Senate have to pass a bill in the same form for it to become law.
  • Once Congress has passed a bill, the president has the power to veto that bill. In turn, Congress can override a regular presidential veto by a two-thirds vote of both houses.
  • The Supreme Court and other federal courts (judicial branch) can declare laws or presidential actions unconstitutional, in a process known as judicial review.
  • In turn, the president checks the judiciary through the power of appointment, which can be used to change the direction of the federal courts
  • By passing amendments to the Constitution, Congress can effectively check the decisions of the Supreme Court.
  • Congress (considered the branch of government closest to the people) can impeach both members of the executive and judicial branches.

Checks and Balances in Action

The system of checks and balances has been tested numerous times throughout the centuries since the Constitution was ratified.

In particular, the power of the executive branch has expanded greatly since the 19th century, disrupting the initial balance intended by the framers. Presidential vetoes, and congressional overrides of those vetoes, tend to fuel controversy, as do congressional rejections of presidential appointments and judicial rulings against legislative or executive actions.

But overall, the system has functioned as it was intended, ensuring that the three branches operate in balance with one another.

Roosevelt and the Supreme Court

The checks and balances system withstood one of its greatest challenges in 1937, thanks to an audacious attempt by Franklin D. Roosevelt to pack the Supreme Court with liberal justices. After winning reelection to his second term in office by a huge margin in 1936, FDR nonetheless faced the possibility that judicial review would undo many of his major policy achievements.

From 1935-36, a conservative majority on the Court struck down more significant acts of Congress than any other time in U.S. history, including a key piece of the National Recovery Administration, the centerpiece of FDR’s New Deal.

In February 1937, Roosevelt asked Congress to empower him to appoint an additional justice for any member of the Court over 70 years of age who did not retire, a move that could expand the Court to as many as 15 justices.

Roosevelt’s proposal provoked the greatest battle to date among the three branches of government, and a number of Supreme Court justices considered resigning en masse in protest if the plan went through.

In the end, Chief Justice Charles Evans Hughes wrote an influential open letter to the Senate against the proposal; in addition, one older justice resigned, allowing FDR to replace him and shift the balance on the Court. The nation had narrowly averted a constitutional crisis, with the system of checks and balances left shaken but intact.


Checks and Balances, The Oxford Guide to the United States Government.
Baron de Montesquieu, Stanford Encyclopedia of Philosophy.
FDR’s Losing Battle to Pack the Supreme Court,

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