Every 10 years, following the CENSUS, states are required to redraw district lines. This involves two closely linked, but distinct, processes: reapportionment (the reallocation of congressional districts among states to account for population shifts) and redistricting (the redrawing of district boundaries to ensure districts are of equal population within a state to comply with the principle of “one person, one vote”). While reapportionment only applies to congressional districts, all representational bodies that use districts—including some judicial districts and local governments—are required by federal law to redraw their boundaries following the census. https://www.ncsl.org/research/redistricting/redistricting-systems-a-50-state-overview.aspx
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