In which case, policy, or situation did the motto “kill the indian, but save the man” play an important role in western expansion?

the motto “kill the Indian, but save the man” play an important role in western expansion then that of boarding school era this policy send the american children to the boarding in an effort to replace William pratt a military officer 
had this motto
hope it help

The correct answer is c. assyrians.all of the others invaded and fought mesopotamia, while assyrians actually ruled in mesopotamia.