One of the main reasons why governments need ambassadors to foreign Countries is because the ambassadors have an intimate relationship with many high ranking officials in said country--making it easier for the two countries in question to enact trade deals and other mutually beneficial measures.
The main idea of this document is that the United States government sets aside lands as reservations for Native Americans since the Native Americans were forced from their traditional lands onto reservations.
The act where Native Americans were forced out of their lands is inhuman.