Jim Crows Laws

Under the Jim Crows Laws, black and white people were segregated in virtually every aspect of daily life in the South, including public transportation. Bus and train companies had not provided separate vehicles for the different races, but did enforce seating policies that had separate sections for the blacks and for the whites. School bus transportation, however, was unavailable in any form for black schoolchildren in the South. They were forced to walk to and from school everyday. Parks recalled going to elementary school in Pine Level, where the school buses took white students to their school while the black students had to walk to theirs: "I'd see the bus pass every day… But to me, that was a way of life; we had no choice but to accept what was the custom. The bus was among the first ways I realized there was a black world and a white world."
http://en.wikipedia.org/wiki/Rosa_Parks

At one time people considered a black world and a white world. Soon after there were people who helped change those views. There are no two worlds. There is only one which we all share. We are all equal and each of us should be looked and treated the same.