What is a “violent upheaval”? Without a specific definition, such as “civil war resulting in 620,000 deaths”, they’re fairly easy to predict.
> between 15 million and 26 million people participated at some point in the demonstrations
> arson, vandalism and looting caused about $1–2 billion in insured damage between May 26 and June 8,
> By early June, at least 200 American cities had imposed curfews, while more than 30 states and Washington, D.C, had activated over 62,000 National Guard personnel in response to unrest.
> By the end of June, at least 14,000 people had been arrested at protests
https://en.wikipedia.org/wiki/2020%E2%80%932021_United_State...