Given much of the economic growth is in tech and tech tends to concentrate in urban centers, urban centers tend to be blue. Can this be much of a surprise? The Administration's self-promoted gains in manufacturing and mining are impaired by some of that technology. Automation has played huge roles in the very industries Trump heralded for his voter base in 2016. You no longer need an army of humans on the production floor or even in the coal mine, making those, formerly high-paying jobs, a thing of the past. This leaves an entire population of disenfranchised to whom immigrants are a major threat as is outsourcing. So these numbers and graphs should not be a surprise to anyone.