Which era spanned from 1750 c. e. to 1945 c. e.

The Modern Era spanned at this time. Hope this helps.

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".

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