Final answer:
Population equality is a primary criterion for drawing electoral districts, ensuring that districts have roughly the same number of inhabitants for equal representation.
Step-by-step explanation:
One of the primary criteria for drawing electoral districts is Population equality. According to the U.S. Supreme Court's decision in Reynolds v. Simms (1964), known as the one-person-one-vote rule, each vote should count roughly the same, which necessitates that districts are redrawn to have roughly equal populations to ensure even representation and prevent malapportionment. The United States Constitution requires that district boundaries be revisited and potentially redrawn after each decennial U.S. Census to reflect any changes in population distribution. The importance of population in drawing districts is significant, as it determines the number of representatives a state has in the House of Representatives. As such, states must ensure that their districts represent the people equally based on population, defined by a minimum population density.