Boarding schools aren’t popular in the USA. Where they are used for poverty reasons (eg China), racism is easily involved (Uighur kids are more often shunted to boarding schools than Han kids in xinjiang). We also tried this with Native Americans in the 20th century and that turned out really bad.
>>seanmc+(OP)
That turned out really bad because only the problem (political problem) kids went there, and they also were often privately run and had very lax oversight.