Challenges facing Native Americans in the 20 and 21st century

The 1930s produced some of the most sweeping changes in the history of U.S. Indian policy. Who was John Collier and what were his motivations in pushing for changes to the U.S. Indian policy? Discuss the Indian Reorganization Act of 1934. What was/is its significance? How did it deviate from previous policies? What were its main successes and failures?