The Whigs were strongest in the towns，cities，and those rural areas that were fully integrated into the market economy，whereas Democrats dominated areas of semisubsistence farming that were more isolated and languishing economically.
(whereas结构)
在城镇和那些与市场经济完全接轨的农村地区辉格党的势力最强;而民主党控制经济上孤立而薄弱的贫穷农业地区。
分句1：The Whigs were strongest in the towns，cities
分句2：and those rural areas that were fully integrated into the market economy
分句3：whereas Democrats dominated areas of semisubsistence farming
分句4：were more isolated and languishing economically
1、2和3、4并列
1和2并列
3和4嵌套
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