How did the persians transform their dry environment into a place where humans could live and prosper Slave labor
The qanat system
Moving civilization near an ocean
They invaded people who had rivers that they could take water from

African americans at the time just came out of slavery and needed money to provide for there families. so they joined for the money mainly.

Britain altered native american societies culturally because some of the indian tribes were friends with the british and thought them their culture and the british did the same.some of the tribes didn't like the british and fought against them with france, some tribes didn't want anything to do with the europeans and left them alone.trade with the british changed them economically because they were now trading food for things like guns and blankets.