Pat B is perhaps recalling a Golden Age which never existed.
Vituperation has been a cornerstone of American politics since the early days. The election of 1800 (basically a battle between partisans of Adams, Jefferson, and Burr), for instance, was hardly decorous. But at least it was about issues, more or less. That ended, apparently for good, with the election of 1840 (you know, "Tippecanoe and Tyler Too"). The modern innovation is the increasing length of the election season, which is starting to make the country look like it's stuck on silly nearly non-stop.
American politics has always revolved around apparently irreconcilable conflicts. At one time the irreconcilable conflict was Abolition (of slavery). A bit later the irreconcilable conflict was Prohibition (of alcohol). Read some political commentary from the 1920s - H.L. Mencken's columns are often reprinted these days - and you'll wonder just what the hell was going on. The crisis doesn't translate well for modern readers. The question of Prohibition then dominated nearly everything. Now, it simply isn't an issue, or even a consideration. American irreconcilables tend to go away, given enough time (and, rarely, a war).
The great irreconcilables today are abortion and gun control. The abortion battle has perverted American liberalism such that over the last 40 years or so it has become unrecognizable, as all other principles have been sacrificed to the preservation of Roe v. Wade. But the abortion question's effect has been nowhere near as great as that of Abolition a century and a half ago. Likewise, Prohibition was a far sillier program than today's gun control efforts.
So I think Pat is just having one of his bad days.
Certainly his question about what does it mean to be a country is a legitimate one. But it's not a question which really needs to be answered, except for a few details. For instance, a country without border controls of some sort isn't a country at all, it's just a colored area on a map. That's a detail, but a moderately important one, and somebody should be working on it. At the moment the governor of Texas is giving it a go, since the Feds seem to be uninterested, or too feeble to manage.