National History Day, in collaboration with the Library of Congress Teaching with Primary Sources Consortium, created this open-access teacher guide filled with hints, tips, and activities to encourage student inquiry and historical research. The Guide to Student Research and Historical Argumentation provides an overview of the inquiry process, explores primary and secondary sources from the Library of Congress, and helps teachers guide students to construct historical arguments. The book targets important historical thinking skills that often challenge students. The Guide to Student Research and Historical Argumentation was developed through a Teaching with Primary Sources grant from the Library of Congress.