> Many countries have undergone revolutions or schisms in the past century: Arab Spring countries, Soviet Union, Cuba, China/Taiwan, Korea, Yemen, etc.
The US is nothing like those countries. As a matter of fact, all the "schisms" in the countries you listed are due to the US.
> Recently there have been major catalysis for social unrest, including: increasing economic inequality, novel technological shifts (automation, social media disinformation and censorship), and climate change affecting industries and migration.
Most of the population is in the eastern hemisphere ( 6 billion people ). Whatever problems occur with climate change, migration, etc they are going to have to deal with it, not the US or the western hemisphere. As for social media, most of it is under US control so not much to worry about there. It's europe, india, china, middle east, etc who have to worry about social media destabilizing their countries. And I suspect, it will be the US spearheading the destabilization.
> What are your thoughts on the likelihood that the US will experience a massive upheaval and what precautions can be taken?
Pretty much zero. The Arab Spring countries, Soviet Union, Cuba, China/Taiwan, Korea, Yemen, etc. all experienced upheavals because of major foreign interference by a much stronger nation - aka the US. We are the ones that put pressure on the soviet union until it cracked. We are the cause of the isolation and suffering in cuba. The china/taiwan conflict is entirely a US creation. Same with korea. Even yemen is a result of our interference via saudi arabia.
We have no equal to even challenge us, let alone destabilize us to the point of revolution. There is a reason why during times of trouble, the world - including china - buys dollars/us treasuries/etc.
In other words, we create schisms around the world, we don't suffer from it.