These two violent, nomadic herding cultures swept out of Northern Asia to come into conflict with the Indus Valley People. What were these cultures?

4 answers

Your book may be looking for the Aryans. However, most historians today don't believe that Aryans were the conquerors and that the Indus Valley civilization was not destroyed by Aryans.

http://www.indiana.edu/~isp/cd_rom/mod_09/mod_09_x.htm
Yes, but I need TWO cultures.
I just can't seem to find the other one.
http://www.fantasticmetropolis.com/i/tanelorns-seed/full/

http://www.omilosmeleton.gr/english/agarwal.html
which route did captain geoge vancouver travel?