History for the 21st Century (H21) is a grant-funded, collaborative project designed primarily to serve students in introductory college history courses and their instructors. it encourages students and instructors to build, assess, and progressively improve an inquiry-based, modular curriculum that is free to students and instructors. It is a collaborative project designed to enable college and university faculty to effectively introduce 21st-century students to the study of history. The project encompasses both the reconceptualization of introductory history courses and materials to support those courses.