7. who invented the riding plow?
a. robert fulton
b. cyrus mccormick
c. john deere
d. samuel morse

C. John Deere

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".

b]to spread the message of black power