Scary! I hope nobody finds a way to exploit this dynamic for profit.
https://en.wikipedia.org/wiki/Internet_Research_Agency
I'm sure other nations are involved, Russia has just done the most recorded damage so far. The entire point of red vs blue, black vs white, rich vs poor rhetoric is to divide and conquer the American people.
But yes, the divisiveness and corrosive, adversarial dynamics of the discussion around those issues is largely synthetic. And it's not just from other countries. A lot of American citizens that have power in the status quo would prefer if the status quo were not possible to productively challenge. And a lot of other American citizens that care about nothing simply don't mind fracturing and dismembering the discourse if doing so is the most convenient way to maximize paperclips— Uh, ad profits.
I hate to bring up the Jews, but they are a classic group that fits the description. Arguably wealthier than average but blamed for everything by some people. Certainly nobody would deny they are facing racism. The leftists who call everyone Nazis are terrorizing innocent Jews around the country right now.
It's kind of the perfect storm, because both sides of the argument include a mixture of reasonable well-intentioned people, and crazy extremists. However you choose to be upset about this, you always have someone crazy to point at.