In A People's History Of The United States why was the emergence of the American Indian Movement (AIM) a surprise to whites?

The answer
to this question can be found in Chapter 19 of A Peoples History of the United
States.  This chapter is entitled Surprises.  The brief answer is that, according
to , the white people of the United States had felt that the Native Americans had been oppressed
so much that they would not be heard from again.

In this chapter, Zinn
argues that the American government and people...