What is the best reason to conclude that the author wants the reader to admire American Indians?

The author uses words, such as “valiantly,” that have strong emotional connotations of courage and respect.
The author repeats the word “tribe,” which places American Indian communities in a positive light.
The author uses the metaphor “physician and lecturer,” which emphasizes a feeling of authority.
The author makes an allusion to “the early 1900s,” which creates a sense of the significance of American Indians.