Answer:
There is no evidence that reservations served as an example to Adolf Hitler. In fact, Hitler's views on Native Americans were informed by a romanticized and inaccurate idea of them as a "noble savage" race, and he believed that they had been destroyed by the inferior influence of European civilization. It is possible that Hitler was aware of the treatment of Native Americans in the United States and used it as a justification for his own genocidal policies toward Jews and other groups he deemed inferior, but there is no evidence that he specifically cited reservations as an example or drew inspiration from them.