Who do you think? And they didn't just start in 2020 either. We'll have an article on this topic (and historical Census pandering to Democrats) shortly. First line will be something like: "When you hear the term 'Deep State' you probably don't think of the Census Bureau, but maybe you should." A non-paywall link (unlike WSJ dot com) to this story is here. The 2020 rigging involved undercounting population in Republican states and overcounting Democrat states, for the purpose of affecting Congressional reapportionment.

The author's premise as to why people move ("extreme inequality") is humorous, but the question is still a good one and that's why we're here. Click on Demographics, pick a state, county or city and see how the area is trending. You can also view Election Results for all states and counties (and some cities, and even individual precincts) to determine how an area is trending electorally.

The real reason why people move is extremely simple: everyone wants to live in a good area with quality schools, nice neighborhoods, clean streets, lower crime rates, away from the political policies and pathologies which make urban areas and even many suburban areas far less desirable places to live and raise a family than they once were. But invaders who bring those patholigies with them eventually turn the good area around, gradually at first and then much more noticeably, which forces the people who were there first -- the ones who made it good in the first place -- to move even farther out from the cesspool they originally fled, with its bad schools, high crime, corrupt one-party politics, dangerous neighborhoods and shopping areas, etc.