Why was the Indian boarding school created?

They were founded for the assimilation of Indian youth and children.

Explanation:

Indian residential schools were established and began operations in the late 19th and early 20th centuries. These institutions' primary goal was the assimilation of Indian children and their introduction to European and American culture. Attendees of these schools had the opportunity to get acquainted with Euro-American culture and gain a basic education in various fields. Catholic missionaries originally founded the schools, and the United States government-funded the complete project.

it is a part of john locke's natural rights popular during the age of enlightenment that people had inalienable rights to life, liberty and property. this was reflected by thomas jefferson in his declaration of independence as rights to life,liberty and the pursuit of happiness.

another line in the declaration of independence is that people have certain rights just because they are human. humans are capable of obeying the three natural rights john locke mentioned making them governable by these laws and therefore entitled to these rights as well.