Answer:
I believe the answer is "It represents the mixing of two cultures"
Step-by-step explanation:
When Iron Shell found the piece of iron and was confused about the meaning and wasn't sure why a white mans possession would be of importance to him. When Iron shell went to the boarding school he resented the white people and did not want to have anything to do with the place or people because white men were of his culture's enemy. He realizes that the piece of iron led him to be a black smith and work with the white man's iron. So in the end Iron Shell had mixed his culture with the white man's culture by being black smith, and the iron shell piece is what led him there.