Components
開国 is an exact match with one form of the following word:
開国
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Reading : かいこく   
1. founding a country
2. opening of a country (e.g. Japan) to the world  (see also: 鎖国)
My mastery:
My current mastery of 開国:
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My flashcards:
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Usefulness and usage:
Kanshudo usefulness level: 6 (among the 15,000 most useful words in Japanese)
• Kanshudo usefulness level is based on a usefulness score of 71,523 which gives a rank of 11,392
開国 is the most useful form. 1 additional form is shown below.
• This form is used about 80% of the time
• Google Japan frequency rank: 107,000 (about 1,530,000 results)
• Wikipedia most common 20000 words rank: 18503
• This form appears in the 24,000 words in the Mainichi Shimbun frequency analysis by Alexandre Girardi
• This form is in band 22 in the EDICT word frequency file (bands go from 1-48, where 1 is most common - each contains about 500 words)
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Example sentences:
べいこく
米国
せいふ
政府
にほん
日本
かいこく
開国
させよ
こころ
みた

The U.S. Government made an attempt to open Japan's doors.
かいこく
開国
にほん
日本
ぶんめい
文明
おお
きな
えいきょう
影響
もたらした
The opening of the country had a great influence on Japanese civilization.
しゅとう
種痘
でんらい
伝来
にほん
日本
かいこく
開国
こくさい
国際
ネットワーク title of book, album etc.
Introducing Smallpox Vaccinations from Abroad: The "Opening" of Japan and the International Network of Wisdom
かいこく
BOOST
My flashcards:
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Usefulness and usage:
• This form is used about 20% of the time
• Google Japan frequency rank: 166,000 (about 460,000 results)
• This form appears in the 24,000 words in the Mainichi Shimbun frequency analysis by Alexandre Girardi
• This form is in band 22 in the EDICT word frequency file (bands go from 1-48, where 1 is most common - each contains about 500 words)
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カイ   あ to (be) open   あける    ひら to open (something)   ひらける to open out (eg view)   
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start, initiate   
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イチ   イツ   ひと    ひと- one   
twenty; two hands   
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ジュウ   ジッ   と    とお ten   
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stick   
モン   かど gate   
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コク   くに country   
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ギョク   たま jewel   
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オウ    king   
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ド   ト   ground; earth   つち ground, earth, soil   
dot   
box, enclosure   
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