You need to know the name and history of the Indigenous peoples in your geographic area. These resources will help.
The same search tips for books apply to articles. You will need to try various terms ranging from the Indigenous peoples names of your community, specific place names (city, county, township), and terms like claims, land tenure, treaty rights.
Find books using Omni. For help using Omni go to the Omni Guide.
You can get books from other libraries via Interlibrary Loan (RACER). You can search the RACER database and request material directly from other libraries.
You can also search the WorldCat database of library holdings from across North America.
You may find 'primary sources' like stories of early explorers, missionaries, settlers, etc. that interacted with the Indigenous peoples of your community useful.