Some of the goals of Hitler was to start out by eradicating a certain group of people, who were people who were Jewish. He then wanted to promote a certain race of whom he believed were superior, and he wanted to accomplish this by taking over the world, step by step. The world might be completely different if it was still under his influence since our customs, beliefs, and amount of diversity in this world would most likely be completely different (i.e more supremacy among a certain group, less diversity, more conflict between countries to stop issues, etc.)