History (Native Americans in USA and Canada

Referring to both the US and Canada, explain how and why native people tried to affirm their rights in the second half of the 20th century.
That is the question for the essay, please have introduction, 2 body paragraphs and conclusion
just answer the question by using good historical detail (easy to understand)

1)    Referring to both the US and Canada, explain how and why native people tried to affirm their rights in the second half of the 20th century.