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menuAmerican Social History Project  ·    Center for Media and Learning

  • Theme > Expansion and Imperialism (x)
  • Tag > Manifest Destiny (x)

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White Leaders Predict the Disappearance of Mexicans and Native Americans in California

With the Treaty of Guadalupe Hidalgo in 1848, the United States gained over half a million square miles of new lands in the Southwest. However, American settlers who traveled west to settle the land were not moving into unoccupied territory. [...]

An American Journalist Explains “Manifest Destiny”

John L. O’Sullivan was an influential journalist and supporter of the Democratic Party. In 1839, he laid out historical, moral, political, and economic reasons for westward expansion. In 1845, O’Sullivan rallied support for the annexation of [...]

"Troubles in the South-West": Ideology and the U.S.-Mexican War

In this lesson students read a series of documents about the American and Mexican reasons for and against the 1846 U.S.-Mexico War. As they read the documents students identify when the authors employ various foreign policy ideologies such as [...]