Answer:
Reapportionment; redistricting.
Step-by-step explanation:
The reapportionment occurs in each state, according to it's population, to select a quantity of representatives. Article One of the US constitution, establishes that every then years, and according to it's population, the house of representatives will reappoint every ten years.
Redistricting is the process of drawing electoral boundaries in the US, where each state's electoral boundaries are redrawn.
Basically, reappointment occurs with representatives of each state but redistricting draws the electoral boundaries of those states.