Sa
Panuto: Isulat ang makasaysayang pook at pangyayari
lalawigan ng Oriental Mindoro, .​

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 answer is states.

missouri compromise of 1820 which prohibited slavery