Emphasis of harmony with nature
They believe that governments should meddle into things like economy to improve the lifestyle of others. Socialists usually claim that it is necessary for a government to intervene and deal with businesses and the economy because that ensures that there's equal rights for all people and people are protected from exploitation and monopolies and similar things.
The answer is c.empire and republic
Because buffalo were such big animals they could feed a lot of people and many of their parts came to use such as their hides and horns