Re-education efforts began in 2014 and were expanded in 2017.[82][83] At this time, detainment camps were built for the housing of students of the re-education programs, most of whom are Uyghurs. The Chinese government did not acknowledge their existence until 2018 and called them "vocational education and training centers."[82][84] This name was changed to "vocational training centers" in 2019.