We all know, "Sudan" separated into two countries after civil wars between Arab Muslims in the north and non-Muslim groups in the south. The main 'cause was due to different language, and less value of other in their own area. Britishers helped in integration, but they failed. There is no relation of Morocco and Algeria in this and Chad was quite away.
In short, Your Answers would be: "Sudan" and "Egypt"
Hope this helps!