The early Europeans in the United States primarily used a A.
traditional economy.
B.
barter economy.
C.
command economy.
D.
market economy.

B

Explanation:

I think bartet economy

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".