It redraws congressional district boundarys based on population.
States that gain population will gain house seats. States that decline in population lose house seats.
Districts that gain population can be redivided into parts of other districts. Demographics of districts many times determine their political majority.
For example, splitting up a well to do conservative district
and reapportioning population to liberal districts reduces the political clout by splitting up the demographics.
Politicians love to move voters around so it makes the districts “fair” and “balanced”, hopefully in their party persuasion.
Census is used for federal funding formulas.
Beautiful short and sweet explaination. I got it now. I just never realized it started with the census. Thanks.