Who wrote the republic in ancient greece?

Plato.

Explanation:

This work was written at the beginning of the 4th Century B.D and consisted on a series of dialog of Socrates, the master of Plato, with different figures, disciple and even relatives.

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".