Plessy vs. Ferguson was the case that ruled that segregation laws were acceptable specifically the public facilities under the Separate but Equal doctrine. It was later overturned through court decisions and legislation.
I believe the answer is: Feedback
in communication, feedback refers to the response that we have after receiving a certain message. For the giver of the message,feedback could be used as some sort of confirmation to ensure that the receiver is not confused about the content of the message.
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