

As I said, I’m not a fan of generalizations because they have little to do with reality. The US has a political system that doesn’t even take the population of states into account. If that were the case, Harris would have won back then with almost two million more votes.
What US citizens can certainly be criticized for, however, is their passivity. Yes, there are protests in the US, some of which are among the largest this country has ever seen, but given how utterly corrupt the political system is, I cannot understand why there has still been no general strike that could very well paralyze the country until the reforms that have been necessary for decades are implemented, the failure to implement which has led the US to the brink of dictatorship in the first place - and the absence of which has ensured that the country has been an oligarchy for several decades.
I understand your anger and I share it to a certain extent, but I can only warn against falling into nationalistic thinking, because that is precisely the kind of thinking that leads to war and misery instead of exchange and understanding.
Manipulation is indeed happening on mainstream social media platforms to such an extent that this is now very endangering all remaining democracies.
In the Fediverse, however, this has hardly been a problem so far, as none of the participating platforms has a reach that is even remotely relevant. Of course, this network is also vulnerable, even quite significantly due to its decentralized architecture, but I have not noticed any such attempts here so far (except for a few really pathetic users who wanted to give their opinions more weight with various fake accounts).
Nevertheless, what you say is a serious problem, but I don’t think it plays a major role in this network for now.
I think it’s just the usual, completely absurd US “patriotism.” Unfortunately that is still a thing, even under Trump. There are simply a lot of people who believe that it is a sign of excellence when their home country wins the gold medal in Olympic hockey -for some reason people see this as their personal success and act accordingly on social media.