Rethinking Columbus is a fantastic resource to study a variety of perspectives on Columbus Day. It is not appropriate to simply study this holiday from one perspective- it is important to include the Taino perspective as well. This is a great website to use for resources. Rethinking Columbus
The Historical Society has created a new Montana History Textbook that has a lot of Indian History woven throughout the book. This textbook is also available online and I believe you can email The Historical Society to receive a password to access teacher resources.