1) What were the differences in lifestyle and in opportunities for those in America's upper, middle, and lower classes, and how did those differences widen or narrow during the late nineteenth century?

this question makes no sense dude

4 copper and gold, the california gold rush is why im pretty sure.

explanation:

an oligopoly is a term used to clarify the structure of a particular market, industry, or organization. a market is considered oligopolistic or amazingly focused when it is shared between a few companies.