The main way in which aristocracy differs from an oligarchy is that the former is a social class of people, while the latter refers to when a state is ruled by a small elite.
In Plessy v. Ferguson, the Supreme Court ruled that facilities that were "separate but equal" were permissible under the US Constitution.
This allowed the Jim Crow laws to develop wherein African Americans went to different schools, ate at different restaurants or in different sections, and were generally segregated from the population
Explanation:
Asimov's thesis is that the beauty of science is the same as the beauty of nature. He expands on this theory with a grandeur explanation of the vast happenings in nature and the universe, such as the speed of light and sound, and the truth that the stars are really amazingly large suns like our own.