Answer:
C: they wanted to stop the westward expansion of American settlers
Step-by-step explanation:
I know it is not A because why would Americans bribe them to side with the British. this makes this answer incorrect. B is also incorrect because this would be blackmail and could work but this did not happen. that is why this is incorrect. this only leaves you with answer C and it is correct because the natives decided that they needed to protect themselves against the Americans after General William Henry Harrison convinced many Native American Chiefs to sign three million acres of their land to the American government.