Final answer:
The name of the process where district lines must be redrawn when a state's population changes is redistricting. Gerrymandering is the practice of drawing district lines to give advantage to one specific group or party.
Step-by-step explanation:
The name of the process where district lines must be redrawn when a state's population changes is redistricting.
Redistricting is the process of drawing new boundaries for representative districts. This process is necessary to ensure that districts have relatively equal populations and meet the requirements of the Voting Rights Act.
Gerrymandering is the practice of drawing district lines to give advantage to one specific group or party, or to lessen the voting power of a specific group or political party. This practice may be illegal if it specifically targets a minority.