Answer:
The Supreme Court ruled that blacks and white must remain separated but, they have equal things. Though, that was never the case. So, each race had there owns schools. Well, the whites had nicer schools with better teachers and books. The blacks had schools were torn up and had old books that were ripped and such. It was really quite horrible in my opinion. We're all people here and that should have never happened in the first place.
C is definitely one of them
The main reason why ethnic tensions became such a severe problem in the Soviet Union and Yugoslavia is because the the USSR was such a vast territory that it forced many people who had not gotten along for centuries under the same political umbrella.