It's also interesting that Hitlerism came from Austria, because otherwise Hitler's obsession with the Slavs cannot be understood. In Austria between the late 1800s and the Nazi time there was a lot of ethnical tension between the Germans and the Slavs (this being the Habsburg Austria-Hungarian Empire). The Germans had many grievances, many of which justified, against what they perceived to be an overly pro-Slav policy. For example, the decision was taken that public servants had to speak both Czech and German in certain provinces, which meant Germans had a hard time because most of them didn't speak Czech, whereas the Czech did speak German. Also, the government stirred things up by appointing Czech clergymen to German parishes, and many other such issues. Then there were many Jewish immigrants settling in Vienna at the time, further upsetting the balance. Hence a nationalist, pan-German movement grew in Austria - the typical dialectic.
It was all extremely unlikely that an Austrian guy became the German dictator, so you gotta wonder. From a hyperdimensional perspective, if part of the agenda was to attack the Russians and kill Slavs (among other things), this timeline makes sense though.