No i do not think it wont happen again simply because the holocaust is against the law now just like when the united states found out about the holocaust they sent war troopers too auschwitz and other concentration camps and then rescued almost 1 thousand jews well mostly the jews that were left in those concentration camps so since im pretty sure the holocaust will never happen again.
One of the most significant results of the Montgomery bus boycott was that the segregation of busses was ended by court order, although white short-term retaliation was brutal.
