来自《耶鲁大学开放课程：古希腊历史简介 第7集 第7集》

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  in which the frontier is seen to be
  边界对美国人来说
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  a tremendously valuable safety valve to the Americans,
  是相当珍贵的安全阀
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  first as colonists, and then as independent people.
  从殖民地开始 到独立的民族
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  Americans didn't have the kind of terrible class warfare
  美国崛起中并没有此种可怕的阶级斗争
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  and the terrible warfare within cities that
  和分裂战争 而这正是欧洲国家
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  the Europeans had experienced throughout most of their history,
  在整个历史上不断经历的
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  because really unhappy and angry people
  因为真正不满和愤怒的人民
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  could always go west, get new places.
  总会到西方去 找到新的家园
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  I mean, fundamentally,
  我的意思是说 从根本上
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  Kansas is a colony in a certain Greek sense,
  堪萨斯是一个希腊式的殖民地
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  all of these places are.
  所有的州都如此
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  So, that's part of the story of
  所以这解释了