What the 1619 project gets wrong (among many other things) is that 1776 was about shedding off (albeit imperfectly) a Colonialist, slave-owning government.
There is, writ-broadly, a global elite, meet in DaVos, and in general, do think of middle america as "deplorables". Some of both narratives are warranted (sorry), some of are not.
Trump is viewed, in savior like terms, as he is the one, again albeit (very) imperfectly, in the view of the "deplorables" speaks truth to power. He gets many things wrong, and himself a narcissist, but when he says "Stop the Steal" or "Build the Wall", he is speaking in general, using plan three word phrases to broad threats and simple solutions in a way, as evidenced by this board, speaks to and motivates.
I can understand, at some level, the secession motive. If one read Jefferson Davis back in the 1850s, and if one can remove the moral cancer of slavery, there is 10th amendment logic to his arguments.
The challenge will be, if one happens, is who owns the military, technology and the wealth. The North owned it back in the 1850s which ultimately bowed the South. In this case, it lies on the coasts.
My hope is that we can do the basics of enforce the border, enforce our laws, maintain government spending and inflation and try to find an "American center a hub" that regardless of your race and gender, you can agree to (e.g. dignity and power of the individual, primacy of capitalism, rule of law, primacy of the family, etc.) and then if you have cultural variants that you happen to celebrate (tailgating in the south, hunting, indian food and weddings, mexican food, cuban traditions in Miami, at the "spokes", that can be admired and celebrated.