What is the most important trend in US History, to date ? (1860)?

Question: What is the most important trend in US History, to date !? (1860)!?
Best Answer - Chosen by Asker:

The most important trend through ALL of US history is WESTERN EXPANSION!.

It has defined all of American history from 1600 to the present!.
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turning their backs on tea consumption (Boston tea party) and becoming the world's largest coffee consumersWww@QuestionHome@Com

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