All the other comments about Germany and Austria not being so different are kinda right, but histoty wise they had been separated for quite a while at the time so it’s probably wrong to just assume austrians felt as germans and vice versa.
A more personal reason is that since Austria didn’t enroll him for ww1 because he was too weak, he renounced to his austrian citizenship and became an apolide. He was able to get enlisted for germany as a volunteer and thus fought for them, he then spent most of his time after ww1 in germany (especially munich) where he easily got the support from germans as they were tired of the peace treaty imposed to them after ww1 and the failure of the weimar republic and they wanted a strong man to drive the country out of crisis. Personality wise it is said he was pretty apathetic, he didn’t feel any love to any country. He probably didn’t even “love” Germany, likely only using it as a mean to get power.
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