Elections & terms
redistricting
Redrawing legislative district lines, normally after each decennial census, so districts hold roughly equal population.
In full
Apportionment decides how many seats each state gets; redistricting decides where the lines inside a state go. Most states let the legislature draw them, subject to a governor's veto; a growing number use independent or bipartisan commissions. Federal law requires near-equal population for congressional districts and forbids maps that dilute minority voting strength.
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A plain-language explanation for civic education, not legal advice. When in doubt, the official source named above controls.