U.S. History
Full text: http://www.oercommons.org/courses/u-s-history-2/view
World History in the Early Modern and Modern Areas
Full text: http://www.oercommons.org/courses/world-history-in-the-early-modern-and-modern-eras-1600-present/view
Below are OER collections containing a variety of History related course materials (e.g., readings, quizzes, simulations, assignments, and more). Since History encompasses a variety of subject areas, you can search the following OER collections using keywords related to your specific courses.
Search OER Commons using keywords related to your specific courses.
Link: http://www.oercommons.org/
Search MERLOT using keywords related to your specific courses.
Link: http://www.merlot.org/merlot/advSearchMaterials.htm
SEARCH TIP: OER Commons and Merlot allow you to further limit results by sub-disciplines and material type.