What dose the term historiography mean

The study of the writing of history and of written histories.

Hope this helps :D

in 1897, pershing became a tactical officer at west point, and that's where he was given the nickname "black jack." pershing's first name is "john," for which "jack" is a nickname, and he was a white man who commanded black troops. hence "black jack".

the enslaved people onboard suffered from illness with some frequency