The Constitution
Twenty-Second Amendment
The 1951 amendment limiting a President to two elected terms, and to one if they served more than two years of someone else's.
In full
Washington's two-term custom held until Franklin Roosevelt won four elections, and Congress responded by writing the limit into the Constitution. It caps presidential service at ten years in the extreme case. No comparable limit applies to members of Congress, and a statutory attempt to impose one was held unconstitutional in 1995.
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A plain-language explanation for civic education, not legal advice. When in doubt, the official source named above controls.