Is there any possibility the crisis could have become a world war? If not, what's the worst it could have got, under certain circumstances? A Korea-like war? Or only a more disastrous, more bloody conflict within the borders of Congo, with limited foreign involvement?
(Bonus points if Katanga remains independent until after the war, or becomes part of the Federation of Rhodesia and Nyasaland.)
(Bonus points if Katanga remains independent until after the war, or becomes part of the Federation of Rhodesia and Nyasaland.)