The popularity of the nazi party grew in germany because a) it had been declared illegal following world war i and germans resented the ban. b) the spanish civil war had shown that communists could successfully take control if not monitored. c) italian leader benito mussolini had sent troops to germany to train the nazis and instruct hitler on how to take power. d) people were in despair following the loss of the war, the great depression, and the ineffectiveness of the weimar government.