American imperialism is a term referring to the economic, military, and cultural influence of the United States on other countries. The concept of an American Empire was first popularized during the presidency of James K. Polk who led the United States into the Mexican–American War of 1846, and the eventual annexation of the territories like California and the Gadsden purchase.
Read more about American Imperialism: Imperialism and Empire, American Exceptionalism, Imperialism At The Heart of U.S. Foreign Policy, Views of American Imperialism, U.S. Military Bases, Benevolent Imperialism, Factors Unique To The "Age of Imperialism", Debate Over U.S. Foreign Policy
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“Old age begins in the nursery, and before the young American is put into jacket and trowsers, he says, I want something which I never saw before and I wish I was not I.”
—Ralph Waldo Emerson (18031882)