LIN 200 ‘Language in the United States’ is a large general-education course dealing with linguistic diversity in the United States. It is taught online in an asynchronous format and attracts hundreds of students each semester. The pedagogical innovations adopted in this course include the use of guest lectures by leading experts in the field, the design of discussion board activities to facilitate interaction among students and with instructors, and the organization of the material into adaptable learning modules. We adopt a learner-centered approach using the backward-design framework and applying the community-of-inquiry model. The result is a course that succeeds in achieving its main learning goals: to introduce students to the vast linguistic diversity in the United States and to the basic principles of linguistics, in particular, that human language is primarily spoken or signed (not written), that every human group has its own language, and that all languages are equally capable of expressing any human thought or emotion, although their social prestige may differ.