And people are in full distaste of the Democrat leadership....and the fool king Biden.And you have suburbs that used to be reliably Republican now voting Democrat.
Also note the parties themselves change dramatically over a 100 year period. The parties we know today are nothing like those parties 100 years ago. It means NOTHING that a district has been one color or another for 100 years. The colors are shorthand ways to characterize vote by party name. People don't vote for colors. They vote for the candidates and policies of a given party at a given time.