In the reservation system, american indian tribes were confined to assigned land with

Defined borders, is the right answer.

Explanation:

The Indian reservation system was a system of land reservation in which the white settlers took the land of the native Americans and pushed them to live on the defined tracts of land. The primary goal of this system was to bring the native American community under the control of the government of the United States, lessen friction between Indians and immigrants and promote Native Americans to get on the steps of the white man.

yellow fever and other tropical diseases

must repent and believe in god.

or the book

journey across time - chapter 10 "the rise of christianity"