Here are a few documentaries related to First Nations and Indigenous Studies (FNIS) that I recommend, these can all be found on http://topdocumentaryfilms.com :

Sacred Spirit of Water (2013):

Unrepentant: Kevin Annett and Canada’s Genocide (2006):
*viewer discretion is advised

https://www.youtube.com/watch?v=0brD50DIv5Q

America before Columbus (2010):

The Invisible Nation (2007)
http://topdocumentaryfilms.com/invisible-nation/