The only 'riot' that actually affected the US in terms of changing it forever, was the one on Jan 6th. That easily supercedes any other riot that took place. In most places, the police took care of it, with the notable exception of Seattle. However, that city soon came back into the fold.
The Jan 6th riot was a direct assault on the US and what it stands for. It was a bunch of intellectually inept, conspiracy-theory-believing, mainly white middle-aged, election-denying, close-to-naziesque-type behaviour enabling nimrods. It was a disgrace.
At the end of the day, you have a bunch of people who seriously believe that the election was stolen, with NO evidence. Not one shred of provable, verifiable evidence. You know, what is weird - especially on this board - one of the catch cry for climate deniers is "where's the empirical evidence". Yet, when it comes to the election, they don't want ANY evidence, let alone empirical. Apparently all the Repub election verifiers, Trump-appointed judges, GoP governors, were all in on it. It is beyond ridiculous how much of a Banana Republic Trump and his Deplorables want the place to become. It's embarrassing, childish and just downright laughable. And I would laugh, if it wasn't so tragic.
Don't worry about China or Russia fucking the US over. Trump and his Deplorables and these "the election was stolen" rubes are going to turn the country into a shithole.