The correct answer to this open question is the following.
The differences Seattle is pointing between the two groups are the following.
We are talking about a great speech delivered by Chief Seattle, a legendary Native American Chief in the regions of the state of Washington, and the Governor of the state, Isaac Stevens. Historians cannot agree on the exact date of this speech, but they all coincide that was in 1854.
Chief Seattle addressed the concurrence, including Stevens, and he spoke about the Native American Indian territories and how important they were for the Indians who have lived hundreds of years before the white Europeans. He could not believe the fact that whites saw mother earth as property. He asked how the air could be sold, or the water, or the land that provided the Indians practically everything. Indians saw nature as something sacred, meanwhile, whites saw it as property and the opportunity to exploit raw materials and natural resources to make a profit. Governor Stevenson just promised Chief Seattle, he was going to consider the possibility to sign a treaty.
