Which of Satanta’s central ideas do these details most contribute to? Settlers and American Indians must live in peace. United States’ soldiers threaten the Kiowa tribe’s way of life. It is vital to the Kiowa tribe that they maintain their lifestyle. The Kiowa tribe is going to stubbornly remain on their land.

the pronoun reference replaces a noun, but you have to make sure there's no room for confusion.

in the first sentence "her" could be referring to shely or to the sister. the answer there is "shelly called her sister and told her about the new baby."

in the second sentence "it" could be referring to the roof or the floor. the answer there is "since the roof leaks on the family room floor, we need to repair the roof."