From the first Conference on Critical Legal Studies in 1977, difficulties have arisen when trying to qualify what can be defined as critical legal studies. As either a jurisprudential banner or a specific reference, the term critical legal studies can lead to a variety of different meanings with little consistency. This article argues that due to the broad application of critical legal studies across different times and jurisdictions, it would benefit from a structured system of categorisation. By identifying various critical legal studies, this article briefly defines and categorises each major limb in relation to one another, in turn forming a critical legal studies family tree. Once this overview has been presented, this article focuses on the United States of America ('US')-based branch of Critical Legal Studies demonstrating how this method of categorisation provides clarity. Specifically, this demonstration addresses the roots and death of the US-based Critical Legal Studies and its effect on the continuation of critical legal studies works after this event.