. >> al jazeera's yvonne ngdege what is the significance of buhari's victory? >> well, what has happened in nigeria is historic. it's rare. it's unheard of. the opposition winning an election, unseating a sitting president and a ruling party. it's never happened in nigeria since we're seeing the democratic cratic transition of power hand over of power from one democratic ruler to another. through the ballot box in a peaceful way with virtually no incidents of violence. it also hugely significant for africa and a message many analysts are saying for african leaders what nigerian have proved if you want to change your government. if you're dissatisfied with your government's performance. if they have not kept their promises through the ballot box you can remove them. you can change them. it's incredible difficult to summarize how meaningful this historic political event is for millions of nigerian. >> major excitement, huge celebrations. once those have all died down what is going to be the major problems that the president has to tackle? >> well, that's right. a