Domestic commerce was impeded by the jealousies of the states, which erected tariff barriers against their neighbors.

各州的嫉妒心阻碍了国内贸易，这些州对邻国设置了关税壁垒。

In the 19th century, railways and telegraphs brought a sharp decline in transport and communication costs, and were at least as responsible for economic integration as cuts to tariff barriers.

在 19 世纪， 铁路和电报带来了运输和通信成本的急剧下降，并且至少与削减关税壁垒一样对经济一体化负有责任。