Answer: Think of their land as common American Indian property
Step-by-step explanation:
From the excerpt it would appear as though Tecumseh wants Indians to unite and think of their land collectively as common American Indian property which would put them in a better position to resist attempts by the government (white people) to take their land.
It would appear from the speech however, that the white people are encouraging groups not to accept this thought and little wonder because a disjointed response to the whites wanting their land would give the whites better chances of possessing Indian land.