Hi,
The tone of this passage can be described as optimistic or positive. The speaker is announcing that the government's policy of removing the Indians from white settlements is nearing completion and that two important tribes have already accepted the provision for their removal. The speaker believes that the example set by these tribes will encourage the remaining tribes to seek the same advantages. This suggests a hopeful and positive outlook on the progress being made in the removal of the Indians.
I hope that this helped you. :)