Again, I think Ragnar has taken an idealized version of the past as a historical reality. It has never been that simple. A relatively small proportion of Americans have ever been tied to one farm/plot of land across multiple generations.
Immigrant attitudes too, vary widely. A couple friends of Mexican ancestry are as proud to be Texans as any white Texan. Don't know if their family backgrounds are legal or illegal immigrants.
Personally, I have ever felt more allegiance to Michigan as my state than to the US generally, but I suspect I'm hardly typical; my childhood hero was George Washington, and it took me a while realize that when people talk of patriotism they often aren't talking about their state. Deciding to leave Michigan has been, for my family, a major shift; it seems the next iteration in a long immigrant tradition, but my kids are fourth and fifth generation Michiganders from my side of the family. Four generations on the Jewish side, all metro Detroit, five on the Christian side, all southern rural Michigan. My spouse's family has a similarly long history in Michigan--and his mother and all four of her siblings have all stayed in Michigan.
There is not as much migration in modern life as we tend to think. Can't give a cite on that, but I distinctly remember reading some figures on that in some sort of academic context fairly recently. Again, APS is very self-selecting. Many of us are military or former military, and many are of significantly above average intelligence or economic status or both. All those factors tend to lead to a more mobile lifestyle--and almost always have.
Finally, I like pancakes, but prefer mine with jam. Fake syrup is gross, maple syrup is both too expensive and too thin, and any syrup is too messy for me to want to bother with with the kids.