(Note: I'm from the UK so whilst we get some news about America our news cycle isn't dominated by their affairs)
So, in 2020 there was the US elections, Biden won, but Trump is refusing to concede and is basically alleging there was massive voter fraud to prevent his win.
If you look at it from the perspective of a big Trump supporter, it looked like Trump might squeak out a win then suddenly there are a bunch of votes for Biden (aka postal votes) and then Biden wins comfortably, and the person you support alleges that there was massive voter fraud/irregularities and that's why he lost.
From their perspective it seems a compelling argument (though it is said to be wrong), Trump still has a lot of supporters and his base seem to be pretty devoted to him, plus they tend to be the people who are heavily armed and generally like to cause trouble.
Meanwhile throughout 2020, even during the whole pandemic situation, it seems that the USA has become a "riot friendly" country, the deaths of George Floyd and others at the hands of police officers have sparked massive protests across the country which in quite a few cases have turned into riots, with business being looted, property being damaged and further violence and deaths amongst those protesting.
I feel that the potent mix of Diehard Trump fans(with guns, who also generally don't seem to care about the COVID 19 pandemic) + Trump constantly claiming mass voter fraud, would result in violent protests and riots across the country amongst his fans.
Have there been any riots in the US attributed to the recent election results?