Answer:
It shapes how he was raised and lived by influencing his guardians and him and inspiring him to write the book. The book (Section XV, page 51) gives a description of a portrait of Kotsatoah and the author describes how he is inspired and would've like to meet/see the warrior. 'I should like to have seen that man, as Catlin saw him, walking toward me...'
I have read a few books where a culture affects how the character gets along in the story. One good example is from the series 'A Natural History Of Dragons.' The protagonist is a young woman who needs to struggle through the barriers that men have set on her gender and the entire culture of sexism helps to form a strong character who is able to get places.
Explanation:
5.05 Discussion: Personal Identity