WWI contributed to WWII, Germany and Hungary wanting to get back the territory lost and reparations to pay. They attributed it to the Communists and Jews. See Treaty of Versailles and Treaty of Trianon.
Yes, it did. That was my main point. If you stop WWI from happening (and to be honest, I’m not sure that saving the Archduke really prevents WWI) then WWII probably doesn’t happen (or, at least, almost certainly not in the same way) and most of the Jews alive today never end up existing.
The Wolf