What caused the breakdown of the reservation system

The White Settlers in America initiated a unique reservation system (the Indian reservation system) for the native American community. With the arrangements of this system, the white settlers could reside on the land of the Native Americans. However, the main reasons for the  breakdown of the reservation system are the following:

1. Many American Indians refused the power of the officers who engaged treaties that ordered them to relocate to reservations.

2. Living in a confined area was an alien idea to many American Indians

3. White settlers required more of the property that was held for American Indians.

“i think it is very plausible that if there are five votes to end the death penalty, it could be with the people who are on the court right now,” - smith

so basically it is not clearly and consistently imposed