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Nigeria, Ethnic Groups, Spread of citizens, Colonial Nigeria, Name history…

- - - - Covers 2,600 miles, runs into Atlantic Ocean via Gulf of Guinea
        
        Passes through Niger Delta first
        
        Niger Delta is 2nd largest delta in the world
- - - - Introduced by a trader from Mali
    - - Introduced by British missionaries
- - - - 189 million people live in Nigeria
        
        ~1/2 of the Nigerian population is <15 yrs old
        
        Yoruba has highest rate of twins in the world
        
        Igbo Ora is nicknamed "the twin capital of the world" because of its high birth rate for twins
        
        ~158 twins per 1000 births
        
        Attributed to large consumption of yams