This isn't WWI or II. There won't be a WWIII coming out of this and all you're doing is fear mongering. Either that or you're so hateful of Donald Trump that you hope there is a war to further condemn him. I highly doubt, though, that you think that way. You don't sound like a complete buffoon.
If anything, this act by the President to destroy a terrorist leader lowered the chances of actual war. Even though Syria has been murdering Americans for decades and more recently bombing our ships and embassy. But I guess you forgot about that part. Fighting back isn't an act of war, attacking our people and unfurling war flags over Mosques is.