Slash-and-burn agriculture keep the soil fertile for early farmers.
a.
true
b.
false

answer; i believe its a

the confederate at bull run

the answer should be a. the sui empire, the tang empire extended from korea in the west to manchuria in the east.

written by alan ward and published in 2003. ward is a historian and was a professor at the university of connecticut.

if this isn't what you are looking i would like to know more details.