Which of the following is an example of physical systems impacting the environment

Which of these effects of mass production techniques used during 1920

Many blacks moved from the south to northern cities during world war li looking for employment. after the war, a number of them lost their jobs. why did this happen?

Why were the actions of native americans so varied in response to relocation? a. the tribes were very diverse and had different beliefs. b. they were exhausting every avenue. c. they all wanted to get the best financial arrangements. d. many of the tribes wanted ownership of the area.