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Despite the oddity of Donald Trump himself, there was little new in it, even for the imperial power that its enthusiasts once thought stood at “the end of history.” You don’t need to look far, after all, for evidence of the decline of empires. You don’t even have to think back to the implosion of the Soviet Union in 1991, almost three decades ago in what now seems like the Stone Age. (Admittedly, Russian President Vladimir Putin, a brilliant imagineer, has brought back a facsimile of the old Soviet Union, even if, in reality, Russia is now a rickety, fraying petro-state.)

Just take a glance across the Atlantic at Great Britain at this moment. And imagine that three-quarters of a century ago, that modest-sized island nation still controlled all of India, colonies across the planet, and an impressive military and colonial service. Go back even further and you'll find yourself in a time when it was the true superpower of planet Earth. What a force it was -- industrially, militarily, colonially -- until, of course, it wasn’t.

If you happen to be looking for imperial lessons, you could perhaps say that some empires end not with a bang but with a Brexit. Despite all the pomp and circumstance (tweeting and insults) during the visit of the Trump royal family (Donald, Melania, Ivanka, Jared, Donald Jr., Eric, and Tiffany) to the British royals, led by a queen who, at 93, can remember better days, here’s something hard to deny: with Brexit (no matter how it turns out), the Earth’s former superpower has landed in the sub-basement of history. Great Britain? Obviously that adjective has to change.

In the meantime, across the planet, China, another once great imperial power, perhaps the greatest in the long history of this planet, is clearly on the rise again from another kind of sub-basement. That, in turn, is deeply worrying the leadership, civilian and military, of the planet’s “lone superpower.” Its president, in response, is wielding his weapon of choice -- tariffs -- while the U.S. military prepares for an almost unimaginable future war with that upstart nation, possibly starting in the South China Sea.