Write an essay on the encroachment on Native American land was an ongoing proces

Write an essay on the encroachment on Native American land was an ongoing process in attempts to civilize the entire North American Continent. Write an essay discussing this process and the notable Native Americans who are considered the founding persons of the United States. How did they each make a difference in their own way? Discuss their struggles against the status quo, established norms of the time. What hardships did they face? Give as much detail as possible to answer the question.