The American people did this twice in fairly quick succession.

Unless there's a serious reckoning afterwards, the rest of the world is gonna operate on the assumption that it can and probably will happen again soon.

I really hope so but honestly, what lessons have Democrats learned so far that will allow them to take the votes of those who are not right-wing radicals? Because there was a lot of unnecessary stuff that was going on that pissed off those who don't lean too far either side. Trump exploits this by, say, "Keeping Men Out of Women's Sports" and scores high not just on the right. This theme will be very difficult to deal with by the Democrats.

And on the foreign front, well, the trust has been broken and I don't think it can be repaired easily. The remaining NATO allies are very stable, they understand mutual respect and collaboration is the foundation of their survival, whereas attacking each other breaks trust completely. Even if a new fantastic president is chosen that understands his huge responsibility both for Americans and the world, other countries learned their lesson hard and understand there is no guarantee in a few years the USA become their enemy again.