Bonus Questions: From the example of study on existing sourc…

Bonus Questions: From the example of study on existing sources, which religious group had the most over-achievers in the US?  Who developed the first lettered alphabet?  In what century did Karl Marx live?  In the US, where would you go to find the greatest evidence of Afrocentrism?  Name a drawback and an advantage of using an interview as a research method?