What sparked the exodus?
It had to be either Climate Change or those wild MAGA maniacs roaming the streets at night.
Or maybe it was both.
As these companies depart, jobs for the middle class go with them. So middle class workers also leave. The one class that might vote in a way that would reverse the trend. Thus. these cities become like the third world, a small, rich ruling class, and a large, hopeless lower class.
Now consider that the hopeless, uneducated urban lower class will always be led to vote for the blandishments of the rulers, being unequipped to think for themselves. And that the lower class numbers are being grown with the addition of millions of “migrants” from equally stratified third world regions.
Need I go on?