来自《耶鲁大学开放课程：美国内战与重建1845-1877 第6集 第6集》

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  was never accepted as the border by Mexico;
  墨西哥人从未承认
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  but that's never stopped wars of conquest before,
  但是那没能阻止征服的战争
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  and why would it then?
  为什么呢
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  Now, just to give you a bigger sense of this story.
  就是从一个更广的角度来讲述这段历史
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  We've already talked a lot about
  我们已经谈过了
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  how the westward expansion of a slave society
  奴隶制社会的西向扩张
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  and the westward expansion of the South
  以及南方的西向扩张
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  was just booming from the 1820s
  这股热潮从19世纪20年代开始
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  through the '30s into the '40s.
  一直持续到30年代40年代
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  And there was a deep and abiding assumption in America--
  在美国有一种根深蒂固的理念
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  and we call it Manifest Destiny.
  我们称之为"天定命运论"
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  At the time not everybody was walking around
  那时候不是所有的人都是