The United States of the 19th century and the United States of the 20th century differ a great deal. In most of the 19th century, the US was isolationist and did not get involved much in the affairs of the world. However, by the start of the 20th century, the US began to get involved a greater amount in world affairs. The Spanish-American War (1898) established the United States as a world power and caused the US to follow the path of imperialism.
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