Out of commerce and manufactures and the construction and operation of railways came such an accumulation of capital in the Northern states as merchants of old never imagined.

——由于商业和制造业以及铁路的建设和运营，北方各州的资本积累如此之多，这是古代商人无法想象的。

People who live longer may care more about threats that are further away, such as the state of the world in 2100. Longevity permits the patient accumulation of capital, a factor in the emergence of a middle class.

寿命较长的人可能更关心更遥远的威胁，例如 2100 年的世界状况。长寿允许资本的耐心积累，这是中产阶级出现的一个因素。