The first reservations for american indian tribes were established by the indian removal act. by the dawes act. after the civil war. during the colonial period.

 By the Indian Removal Act..
Which is why they needed the reservations.

The Dawes act was to turn Native Americans into farmers and Land owners.
Depending on what you're learning it could be either the Indian Removal or Dawes Act..
Hope this helps you out a bit!

Its "during the colonial period."

Idon’t know who knows i do know who does not know me