The term impeachment refers to
a. benefits the president receives while in office
c. accusing a federal official of misconduct in office
b. removing an elected official from office
d. taking away privileges from the president and giving them to congress

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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".