With the (re-)discovery and gradual transcription and translation of native-language primary sources in the twentieth century, a new branch of Mexican ethnohistory developed around Mesoamerican native-language research. This scholarship has profoundly reshaped the understanding of a history that for centuries had followed a Eurocentric paradigm. The arrival of the Internet age has further revolutionized this trend. With the recent push both to preserve rare or fragile sources and to make them more widely accessible through digitization, educators and students alike are no longer limited to excerpts from indigenous texts that experts in the field chose to include in their publications of primary source readers. More and more students have home access to the Internet, and colleges and universities are investing in free access to online resources for their constituents. Mexican conquest history has been a prime beneficiary of these developments. This essay will focus on two publications in particular: (1) Book XII of the "Florentine Codex," which is available from the Biblioteca Medicea Laurenziana (Laurentian Library) via the World Digital Library; and (2) the "Lienzo de Tlaxcala," which a team of scholars from the Mesolore Project associated with Brown University made available in its entirety for the first time since the nineteenth century. This paper explores the opportunities that using digitized indigenous primary sources in the classroom bring to the teaching of Mexican conquest history.