Segregation is the practice of requiring and other services for people of color. Segregation was made law several times in 18th and the 19th-century America as some believed that black and white people were incapable of coexisting.
Rosa Park worked as a seamstress and when she was arrested, it was the beginning of the protest against race.
At one point, a white man had no seat because all the seats in the designated "white" section were taken. So the driver told the riders in the four seats of the first row of the "colored" section to stand. the three others obeyed. Parks did not.