sentences:  Some American boarding schools offer a post-graduate year of study to help students prepare for college entrance.In some times and places boarding schools are the most elite educational option (such as Eton and Harrow, which have produced several prime ministers), whereas in other contexts, they serve as places to segregate children deemed a problem to their parents or wider society.Canada and the United States tried to assimilate indigenous children in the Canadian Indian residential school system and American Indian boarding schools respectively.