It's only certain elections that rely on the ever changing districts (largely state and federal legislators).
The districts only change every 10 years. The motivation is to keep the variation in population between the districts low.
The districts only change every 10 years. The motivation is to keep the variation in population between the districts low.
For states, they each get to decide how to structure their own government. Many do have 2 houses. Here the upper house is elected from larger districts than the lower house, but each member represents 1 district.