Supporters of using the atomic bomb at the end of World War II believed that

That it would force japan to surrender and end the war

Explanation:

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".

your mothers brothers brother in law would be your father.