They give us informations about our ancestors and how did they live and what did they do and than compare it to present way's of life.
Answer:
Buhari is the President of Nigeria
Yessss I'm great at geography... what grade level?
Iraq it has boundarys that are arbitrarily drawn, with no real common bondage among the people.
The disease has infected a few people, spread out over a large distance because Cholera can't suddenly spread, it infects few people and then spreads rapidly.