Reading comprehension

1.- Pan African is a term that relates to people form all African countries and is usually used as a reference to the Pan Africanism, which is an ideology that tries to conceal the unity of the African country. This concept is important because it reaches to all people so they feel identified with this term, which unifies them.
2.-  idk

3.- Thao Mbeki was deputy president when Mandela was the president of South Africa. He was the first chairperson-in-office of the Commonwealth of Nations. Mbeki reduced the unemployment of the population and raised the country's economy by 4.5% per year during his term.
4.-
Repetition: I have seen the corruption(...). I have seen concrete expression(...).  This repetition contrasts the idea he is trying to conceal. He is trying to show people hat he knows what is really going on.
Allusion: "(...) to remind ourselves of the Latin saying: Gloria est consequenda- Glory must be sought after. ". He not only advocates a phrase that makes him sound smart, but the phrase has the purpose to create a feeling on the people, by alluding a concrete famous phrase.
Metaphor (figurative speech): "My body has frozen in our frosts(...)". He is alluding to having lived through the weather of Africa.

This rethorical devices really complements the speech, giving it more authority and giving it the ability to reach the audience, appealing to Ethos and Pathos, as well as Logos.