The evidence will be the sentence that shows what provoked Gihwa's sympathy with the rulers and the upper class.
We can arrive at this answer because:
Textual evidence is that which justifies and proves that certain information is true.
In this case, to confirm Gihwa's sympathy with the rulers and the upper class of a region, it is necessary to show what generated this sympathy, showing that it existed because it was provoked by something.
This evidence can also be shown through sentences that show the results that Gihwa's sympathy elicited.
In this case, to answer this question, you must read the citation to which the text refers and identify these pieces of evidence.
You have not provided the quote the question refers to, which makes it impossible for me to provide a specific answer, but I hope the information given above will help you.
Between 1887 and 1933, US government policy aimed to assimilate Indians into mainstream American society. ... Federal policy was enshrined in the General Allotment (Dawes) Act of 1887 which decreed that Indian Reservation land was to be divided into plots and allocated to individual Native Americans.
the meaning of the quality or state of being high or higher in quality. : the belief that you are better than other people. : the quality or state of being larger, stronger, etc., than others.