求翻译：1 8 世纪中叶， 资本主义经济主要集中在北部各殖民地。 这里的大商人因为从事黑奴贩卖活动，从中获取了巨额利益，成为资本主义原始积累的重要手段之一。重要的工业部门是造船和冶铁业。捕鱼业也很发达。波士顿成为北部工商业的中心.是什么意思？

18 century, the capitalist economy is mainly concentrated in the northern colonies .

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1 8 century middle, capitalist economy mainly concentrates in the north various colonies. Because here big merchant is engaged in the black slave to trade the activity, gained the large amount benefit, becomes one of capitalism primitive accumulation important methods.The important industry sector i

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