The end of the Spanish-American War in 1898 placed the United States in the position of being a world power by -

The Treaty of Paris ending the Spanish-American War was signed on December 10, 1898. In it, Spain renounced all claim to Cuba, ceded Guam and Puerto Rico to the United States and transferred sovereignty over the Philippines to the United States for $20 million.May 14, 2010

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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.

answer; i believe the correct answer is benjamin harrison;