AncestryK12 offers free access for one year to all the original and primary documents of Ancestry's U.S. Collection for use in any K12 classroom.
http://www.ancestryclassroom.com/
Historical Newspapers
Find historical newspapers from across the United States and beyond. Explore newspaper articles and clippings for help with genealogy, history and other research.
https://www.newspapers.com/
Fold3
Fold3 provides convenient access to US military records, including the stories, photos, and personal documents of the men and women who served.
The Fold3 name comes from a traditional flag folding ceremony in which the third fold is made in honor and remembrance of veterans who served in defense of their country and to maintain peace throughout the world.
Original records at Fold3 help you discover and share stories about these everyday heroes, forgotten soldiers, and the families that supported them. On Fold3, you can combine records found on the site with what you have in your own albums and shoeboxes to create an online memorial for someone who served.
https://www.fold3.com
FamilySearch
It's all about family. FamilySearch is a nonprofit family history organization dedicated to connecting families across generations. FamilySearch believes that families bring joy and meaning to life.
Our Vision
Learning about our ancestors helps us better understand who we are—creating a family bond, linking the present to the past, and building a bridge to the future.
https://familysearch.org/