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Monopoly: There is a single seller in the market
Oligopoly: every company in this market structure is aware of the actions of the other companies (oligopolies are a small number of companies controlling the markets- there are elements of collusion in this structure because the firms work together to control prices and the market)
Perfect Competition: There are no barriers to entry (lots and lots of competing companies that each have a small share of the market)
Collusion: 3 companies secretly enter into a price agreement (this is illegal in many cases)
Most of it was conquered from Mexico not bought, as a result of the Mexican War of 1846, the rest was I guess you could say "bought" through the Gadsden purchase for 10 million dollars.
Answer: Direct democracy
Explanation: From Wikipedia.com; "Greek democracy created at Athens was direct, rather than representative: any adult male citizen over the age of 20 could take part, and it was a duty to do so."
Answer: Small. bands of hunter-gatherers lived, worked, and migrated together before the advent of agriculture
Explanation:
