Need primary sources? You can find a really diverse set of texts at the Internet History Sourcebooks Project at Fordham University, edited by Paul Halsall.
The collection is organized by time period: ancient, medieval, and modern; and by thematic unit: African history, East Asian history, global history, Indian history, Islamic history, Jewish history, history of science, women’s history, and LGBTQ history. (Note that some of the material on this site is under copyright and used by permission, so check before using it in your own materials.)
You can find everything from translations from the world’s first known author, Enheduana, daughter of Sargon, ruler of Akkadia to Lou Gehrig’s farewell speech to baseball.