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He hasn't started any new conflicts and just recently started pulling US troops out of Syria. Can't say that for his predicessors. I understand that people don't like Trump due to his pompous and abrasive personality, but his foreign policy has been suprisingly sane (ignoring all his other policy).
Next.
He has started a (completely unnecessary, in the opinion of almost everybody) conflict with Iran. The violation of the treaty and the sanctions are an act of economic war- which is much cheaper and less bloody than a military attack, but almost equally devastating for the victim. Trump is very happy with choking a whole country and he wants it to die in silence, without making too much fuss. Should he get a Nobel peace prize for that? I don't think so.
Not to mention the fact that Iran isn't happy at all at the idea of being silently choked so it'll keep staging provocations until either it can get a relief from sanctions or Trump is dragged into a war of his own making.
Also, I'm not suggesting Trump get the Nobel Peace Prize, just a little credit for showing constraint.