The answer that best completes the sentence is:
B although
Explanation:
1. "Although" is used to show contrast between two ideas or clauses. In this sentence, it contrasts the idea that most Native Americans fought on the British side with the idea that they considered the Americans to be a threat to their territory.
2. The sentence structure indicates that there is a contrast between Native Americans fighting on the British side and perceiving the Americans as a threat.
3. By choosing "although," the sentence becomes logically consistent and clear in expressing this contrast.
Therefore, the correct answer to complete the sentence is "B although."
