Question

read the sentence from \we are determined not to sell our lands.\
the lands do not belong to the yorkers; they are ours and were given to us by the great spirit.
how does this sentence develop the central idea of the speech?
it explains the history of the lands.
it explains why the tribes say the land is theirs.
it emphasizes that the tribes consult the great spirit.
it identifies who is trying to buy the tribes land.

Explanation:

The central idea of the speech "We Are Determined Not to Sell Our Lands" is asserting tribal ownership of the land. The sentence states the land is theirs, given by the Great Spirit, which directly explains the basis for their claim to the land, supporting the core idea of refusing to sell by justifying their ownership.

Answer:

It explains why the tribes say the land is theirs.