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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The act that gave freedmen the same rights as other American citizens with the exceptions of the right to vote is :
Civil rights act of 1866
Hope this helps
O would say c but im not 100%