求翻译：内战前后，特别是内战之后到第一次世界大战前，美国完成了经济上的统一，凭借优越的自然条件，良好的政治制度，美国经济得到迅猛发展，至19世纪末，美国已跃升为世界第一经济强国。是什么意思？

Before and after the Civil War, especially after the Civil War to World War I, the United States to complete a unified economic, with superior natural conditions, a good political system, the U.S. economy has been rapid development, and to the late 19th century, the United States has emerged as the

After the civil war, and in particular after the civil war to the First World War, the United States completed the economic unity, with one of the good natural conditions, a good political system, the United States economy has developed rapidly, to the end of the 19th century, the United States has

Around civil war, after specially civil war to the First World War in front of, US has completed in the economical unification, relies on the superior natural condition, the good political system, the American economy obtains the swift and violent development, to 19 century's ends, US jumped for the

Before and after the civil war, especially prior to the first world war after the civil war, United States complete economic unity, with excellent natural conditions, a good political system, United States economy rapid development to the end of the 19th century, United States has jumped as a world

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