He decided to challenge the exploration of the Dark Continent.

The history of the British Empire occupies a particularly important part in world history.

As a result of the referendum, the new law was approved.

Dark matter is covering this world.

Japan's gross national product is the third highest in the world.

The history of the Empire of Japan is very interesting.

The Empire of Japan, written as 大日本帝國 in Kyūjitai, was a nation that existed from 1868 to 1945.

My grandfather was a teacher at a national elementary school.

China is a people's republic.

My friend goes to a Korean school.