The North and the South had roughly, as the Northern and Southern states, the Free states and Slave states, had roughly the same geographic size.

北方和南方大致上,北方和南方的各州有,自由州和蓄奴州的区别,但其地理大小总体上相同

耶鲁公开课 - 美国内战与重建课程节选

Now, in that Northern society and here we're using labels pretty loosely, but so be it the northern states; and well I'll leave the outline up for the moment. No I won't.

现在,在北方社会,现在我们标记做得很散,但必须这样,北方的州,我呆会会给你们一个大纲,但不是现在

耶鲁公开课 - 美国内战与重建课程节选

There were some twelve to fifteen different widths of railroads in the Northern states alone by the 1850s, and you could go into one town on a gauge, i don't know, three feet wide but on the other side of town it would come out four feet wide.

在五十年代,单就北方州的铁道,就有十二到十五种不同的轨距,你可能在一条三英尺宽的铁道上进镇,但在另一边出镇时,它变成四英尺宽了

耶鲁公开课 - 美国内战与重建课程节选