19世纪中叶，美国政府采取了一项将印第安儿童美国化的政策，即将印第安儿童赶出他们的家园并且将他们与其文化隔绝。

In the mid-19th century, the US government adopted a policy of Americanising Indian children by removing them from their homes and culture.

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另一个原因是，自20世纪初以来，中国政府一直鼓励人们多喝温水。

Another reason is that since the early 20th century, the Chinese government has encouraged people to drink more warm water.

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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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