noun, noun or participle which takes 'suru', intransitive verb
opening a country to the world; ending national seclusion
Most familiar in historical contexts, especially Japan ending 鎖国 and opening diplomatic or commercial relations with foreign countries. Used as a noun or as the intransitive する verb 開国する.
See also: 鎖国
日本は十九世紀半ばに開国した。
Japan opened to the world in the mid-nineteenth century.
幕末の開国は社会に大きな変化をもたらした。
The opening of the country at the end of the Edo period brought major changes to society.
noun, noun or participle which takes 'suru', intransitive verb
founding a country; establishment of a state
Less common than 建国 for the founding of a country. Often feels historical or formal, as in phrases referring to the beginning or founder of a state.
彼はこの国の開国の祖と呼ばれている。
He is called the founder of this country.