求翻译：在内战前夕，美国是由四个截然不同的区域组成的国家：是什么意思？

On the eve of the Civil War, the United States is a country composed of four distinct areas:

In 1828 and 1832, Congress passed the improving of the European industrial products to the northern part of the state of the industry. Because of this tariff policy will rely heavily on the export to the European large agro-The South Carolina state, and other southern states, the impact of the econo

In the civil war eve, US is the country which is composed by four entirely different regions:

On the eve of the civil war, United States is made up of four distinct areas of the State:

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