Syria was the worst part, because the fallout from that was really bad. Not sure we'd have had Brexit without the extra pressure that put on Europe. Likely empowered Erdogan somewhat (doubt it made a big difference there, admittedly) and contributed to the rise of far right parties in Eastern Europe. Plus, you know, sucks for the Syrians.
Nb. what I blame him for isn't the Syrian civil war itself, but for choosing to get involved in such a way that it's dragged on indefinitely, rather than concluding it one way or the other much faster. This also contributed to destabilization and suffering in Iraq.
Continuing to allow Afghanistan to bleed for his entire 8 years while everyone at the top (and probably most folks in the middle, and at the bottom) knew no progress was, had been, or would be made was a straight-up crime (see: the Afghanistan papers).
But sure, it's hard to beat Bush II for "foreign policy fuck-ups". Dude's a legend in that regard. I wouldn't be surprised if historians in 2100 will look back at that and see it as America falling on its face at the starting line, for this century, and never really recovering.
> Trump’s foreign policy was largely symbolic and detail-free, focused on breaking up US soft power to aid Russia, symbolically opposing China to appeal to anti-Asian racists, making up nonsense about Latin American immigrants to appeal to anti-Latino racists, continuing middle East aggression (and the Muslim ban etc.) to appeal to anti-Arab/anti-Muslim racists. To the extent things went okay it was largely down to incompetence and uncoordination.
Pushing NATO members to meet their defense spending obligations ended up being damn-near prescient, even if the rest of his action on NATO was mostly bad. I'd love to see more breaking down of trade relations with China, so that part was fine by me. Lots of his rhetoric was idiotic but at the same time it was refreshing to see anyone in power talking anti-neoliberalism, for once, even if he was either too ambivalent in-fact or too incompetent to accomplish much. Withdrawing from Afghanistan was way overdue and it disgusted me that NPR ran with "it's just too hard to withdraw in more time than it took to put the same number of soldiers and same amount of equipment in-theater" bullshit, in response. All his stuff related to the Southern border was moronic, of course.
I'm not saying I think he was great—dude belongs behind bars 10x over, I'd say, including for some of his foreign policy actions. In fact, a lot of it's just that, after his predecessors, accomplishing very little was kinda an improvement.