Originally posted by Chimera
Well, with the unrestrained U-boats sinking everything in sight and the infamous Zimmermann Plan to ally with Mexico, I think events forced Wilson's hand. If he had done nothing in the face of such provocations, he would have been branded a lame duck or worse. Also, by 1917 the French were close to collapse and mutinies were breaking out quite frequently. Russia had imploded and the Germans were free to transfer large forces to the West. They would likely have forced the French and Brits to the negotiating table had the US remained neutral thru 1917-8. Of course, had the Germans won WWI under the Kaiser, it's quite likely that WW2 may not have happened at all.
If the US had truly been neutral, and not supplying ONLY the allied powers with weapons and such Germany would not have needed to resort to U-boat attacks and the Zimmerman Plan. We were belligerents long before we declared war...
If Germany won WWI it would have gotten a few more colonies and a little land on the French/German border. There would have been a Soviet-German war restoring a constitutional monarchy to Russia and Germany would have slowly evolved into a democracy much like Britain.
Probably no WWII, almost certainly no cold war.
The world would have been a much much better place.