As of 2015, eighteen states in the nation had enacted tuition equity laws granting resident tuition rates to qualifying undocumented students. The state of Texas was the pioneer of this movement, approving House Bill 1403 in July of 2001. The initiative came to be known as the 'Texas Dream Act' (TDA). It granted a large reduction in the cost of college attendance for undocumented students, moving them from out-of-state to in-state status in terms of tuition and fees. The complex institutional environment faced by the affected population, however, hinders the ability to predict the effect of this reform on education attainment on purely theoretical grounds. Thus, the effect of tuition equity reforms on the postsecondary educational attainment of undocumented immigrant students is theoretically ambiguous, and better studied empirically. This paper contributes to this endeavor by estimating the effect of the TDA on the post-secondary educational attainment of undocumented public high school students. To do this, the author exploits administrative data from Texas public education agencies -- the Texas Education Agency (TEA) and the Texas Higher Education Coordination Board (THECB) -- via the Texas Education Research Center at UT Austin. The author estimates the effect of the reform using a generalized differences-in-differences research design, in which non-immigrant Hispanic high schoolers serve as a comparison group for the group affected by the reform.