政治史学家研究了投票记录、报纸和政治家著作等资料来源，重点研究了19世纪40年代一个新的“美国政治国家”的出现。
Political historians, examining sources such as voting records, newspapers, and politicians' writings, focus on the emergence in the 1840s of a new "American political nation".
我查了下你的投票记录。
然而此观点最近被一些美国学者通过研究美国国会议员在有孩子前后的投票记录得以印证。
But their work mirrors recent findings by American researchers, who looked at the voting records of US congressmen before and after having children.
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