a society divided

Is it impossible to achieve the American dream for people of all races?, I believe it is possible however unlikely based on the film a class divided, since the children that were negatively effected for the time period of the test had put them selves down, they simply lost confidence in themselves it seemed, and being deemed inferior to the other test group. They were subject to scrutiny and insults, the children allowed this group to control them,  even though they were not bound by the superior group..