Bismarck was Wilhelm's chancellor and did a good job on making sure Germany was stable after its unification. He made policies, alliances, treaties, and engaged in war for the betterment of his country. Some may argue that he had more power than the emperor did over politics.
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Hitler did many things that one should be not proud of. Albeit, he was very intelligent and wanted the best for his country and possibly the world. He saved Germany from turmoil as he took it by the reigns when he became the chancellor.