Final answer:
Jim Crow laws were a method of imposing strict segregation in society, enforced through the separation of races in all aspects of life. The United States Supreme Court established the principle of separate but equal in the case of Plessy v. Ferguson.
Step-by-step explanation:
Jim Crow laws were a method of imposing strict segregation in even the smallest aspects of society. These laws required the separation of races in all aspects of life including schools, public buildings, parks, hospitals, transportation, and water fountains. Facilities for African Americans were almost always inferior. The policy of separation was cemented by the United States Supreme Court, who established the principle of separate but equal in the case of Plessy v. Ferguson.