Research an example of a monopoly in the united states economy, past or present. construct a brief explanation of the monopoly and its impact on the market. your response should be about three hundred words. use primary and secondary sources, and cite them.

Monopoly :  a condition in which only one person/company that control a specific sector of a market

Example 
Past : Andrew Carnegie, that monopolized the steel industries
Now : Actually now has little example, but Youtube could be an example of a company that monopolised online streaming market (the competitors own very very little)

hope this helps