The Three Branches of the U. S. Federal Government
Each branch is able to place specified restraints on the powers exerted by the other branches. The US system refers to the branches as "branches of government", while some systems use "government" to describe the executive.
Checks and balances
To prevent one branch from becoming supreme, and to induce the branches to cooperate, governance systems employing a separation of powers typically are created with a system of "checks and balances", a term which, like separation of powers itself, is generally credited to Montesquieu. Checks and balances refers to the various procedural rules that allow one branch to limit another, such as the authority of the president to veto legislation passed by Congress, or the power of Congress to alter the composition and jurisdiction of the federal courts.
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Legislative |
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Executive |
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Judicial |
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Maintaining balance
The theoretical independence of the executive and legislative branches is partly maintained by the fact that they are separately elected and are held directly accountable to the public. There are also judicial prohibitions against certain types of interference in each others' affairs. Judicial independence is maintained by life appointments of judges, with voluntary retirement, and a high threshold for removal by the legislature. In recent years, there have been accusations that the power to interpret the law is being misused (judicial activism) by some judges in the US. In the checks and balances system, the judicial branch has the right to say that something is unconstitutional, like a law or a bill.
The legal mechanisms constraining the powers of the three branches depend a great deal on the sentiment of the people. A common perception is that popular support establishes legitimacy and makes possible the actual implementation of legal authority. National crises (such as the Civil War, the Great Depression, pre-Pearl Harbor World War II, the Vietnam War) have been the times at which the principle of separation of powers has been most endangered, either through official "misbehavior" or through the willingness of the public to sacrifice such principles if more pressing problems are solved. The system of checks and balances is also self-reinforcing. Potential abuse of power may be deterred, and the legitimacy and sustainability of any power grab is hindered by the ability of the other two branches to take corrective action; though they still must actually do so, therefore accountability is not automatic. This is intended to reduce opportunities for tyranny sometimes.
However, as James Madison wrote in Federalist No. 51 regarding the ability of each branch to defend itself from actions by the others, "But it is not possible to give to each department an equal power of self-defense. In republican government, the legislative authority necessarily predominates." Bicameralism was, in part, intended to reduce the relative power of the legislature by turning it against itself, by having "different modes of election a different principles of action." (This is one of the arguments against the popular election of Senators, which was instituted by the Seventeenth Amendment.) But when the legislature is unified, it can obtain dominance over the other branches.
