The city's government became aware of corruption and mismanagement and used various strategies to reform and became more responsible.
European colonists in America, despite promising many, many times to limit their westward settlement, rarely kept their promises and moved westward anyway. This caused immense pressure on Native American communities, who were forced to abandon their homes, farms, hunting grounds, and community systems due to the often violent incursion of settlers. So your best answer is C.
Buffalo was a need to the natives that was their food as well as they used its hide for things
Because nearby governments asked for help so they sent troops. Technically regan actually asked for it though.