First of all, it's worth remembering there are a lot of clear, undeniable similarities of all kinds, things you can measure, between South and North in the 40 years before the Civil War.

首先,值得记住的是有很多明显的,不可否认的共同点,各种各样的共同点,你在对比,内战发生前四十年里的南北双方时就能发现

耶鲁公开课 - 美国内战与重建课程节选