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".
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".
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