reapportionment

A realignment or change in legislative districts brought about by changes in population and mandated by the constitutional requirement of equality of representation (i.e. one person, one vote mandate). A new apportionment of seats in the House of Representatives among States "according to their respective numbers", is required by Art. 1, No. 2 of the U.S. Constitution after every decennial census.

See Westberry v. Sanders, 376 U.S. 1, 84 S.Ct. 526, 11 L.Ed.2d 481.

A similar requirement as to State legislative seats is found in many State constitutions.

See census.

A state statute which violates the rights of persons to vote on a one man-one vote apportionment is contrary to the equal protection clause of the 14th Amend., U.S. Const. Baker v. Carr, 369 U.S. 186, 82 S.Ct. 691, 7 L.Ed.2d 663