He was born an Austrian, yes. But not just that
Right up to 1913, he spent all his life in the Austro-Hungarian Empire. Mostly in Vienna and Linz
Not Germany
So he was 24 when he left for Munich in May 1913
He grew up in the Austro-Hungarian Empire. A cosmopolitan state.
And much of his time was spent in Vienna - perhaps the most cosmopolitan city in that cosmopolitan Empire
Its population was growing by 30K per month (source : Thomas Childers)
And much of this immigration was from Eastern Europe and was Jewish
Hitler was this ardent German growing up in a cosmopolitan state which was hardly German in entirety
But Bismarck desisted from Pan-German nationalism
With the rise of universal male suffrage in early 1900s, this naturally meant German angst in Austria against the "other"
Not so much in Germany, where German power was secure
Because it was in Austria that Germans felt insecure especially with the rise of universal suffrage, which meant greater influence of non-German minorities
Who turned anti-semitism into a political weapon in Viennese politics
Part of his movement was about Anti-semitism - on the need to guard the Aryan race against Jewish infiltration
The other part was anti-Catholicism, as the Church was viewed as a source of cosmopolitanism
This was also the period of the rise of political Marxism through the Social Democrats (mostly a movement powered by Jews)
Lueger too was very vocal in his protests against Eastern European migration into Vienna
He warned - "Greater Vienna must not become greater Jerusalem"
This has some lessons for us on the consequences of cosmopolitanism in a period of nascent democracy
But when those Empires experiment with mass democracy, cosmopolitanism is often a source of troubles.
Would Hitler have shaped up as he did had he lived all his life in say a purely German city somewhere in Prussian heartland?
None of this is to "explain" the rise of Nazism - which remains an odious ideology
But Hitler's youth is an interesting case-study of how democracy + cosmopolitanism proved too heady a mix engendering highly deleterious political views
Would that have prevented the rise of Pan-Germanism (1880s-1900s) and its offspring Nazism in the 1920s?
A valid question
Empires are cosmopolitan
But Democracies are usually antagonistic to cosmopolitanism. Suffrage creates tensions and promotes ethno-nationalisms
You can't have the cake and eat it too
But these will always be uneasy, unsatisfactory safaguards