He went to Alaska in winter to see the northern lights.
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阿拉斯加 is the phonetic transliteration of 'Alaska'; 州 (zhōu) means 'state / province'. The U.S. purchased Alaska from Russia in 1867 for $7.2 million — known historically as 'Seward's Folly' (西华德的蠢事). Capital: 朱诺 (Juneau).