It revolutionized manufacturing, it revolutionized how quickly you could get to markets, and it made Chicago Chicago.
它还带来制造业的变革,让制造和市场迅速地联系起来,其典型代表是芝加哥的兴起
The first is this era, of the 1820s, '30s, '40s and '50s, Antebellum America, exemplified most obviously by the anti-slavery movement, which is where we're going to get to as we leave today.
第一个时期,是十九世纪二十年代,三十年代,四十年代和五十年代,内战前的美国,废奴运动就是其典型,这是我们今天下课前要弄明白的
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