This page gives a list of resources and repositories broken down by region. Educators can search through these repositories to find primary sources that they can include in their lesson plans. The following repositories also have lesson plans that are based around specific primary source sets:
Santa Clara University affiliates interested in looking at a list of curated primary sources by topic can view this google doc, which was created for SCU's Fall 2020 EDUC 289A students. Please note that you will need an SCU login to view the document; however, many of the repositories are included on this page as well.