Apakah kesan perkembangan perkhidmatan kesihatan kepada penduduk tanah melayu​

answer; /// i believe that the correct answer is (d)the huang he river valley;

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".