I think that Hitler saw in Austria the chance to increase the number of loyal, German soldiers - Austrians speak German and are culturally similar so it was easy to include them into the German army and so quickly acquire a great number of loyal soldiers who spoke the language and shared the culture with the Germans.
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Answer:
Spanish. Peninsulares (Spanish born in Spain) ...
Castizos (3/4 Spanish, 1/4 Indian)
Moriscos (3/4 Spanish, 1/4 black)
Mestizos (1/2 Spanish, 1/2 Indian)
Mulattos (1/2 Spanish, 1/2 Indian)
Cholos (1/4 Spanish, 3/4 Indian)
Chino (1/4 Indian, 2/4 Indian, 1/4 African)
Indians