<span>So it was used in the 19th century as the system of slavery in the Southern states in the US.</span>
Answer:
As a large and painful loss of territory.
I believe A. I am not 100% sure but that is my best guess.
The answer is sit-in.
Sit-in, also known as sit-down is a form of demonstration used by African-Americans to protest discrimination. In sit-in, protesters sit down in a segregated business and refused to leave until they were served. One or more people occupies a business or a place where they would do their protest.
