The Bronze Age was an important period in human history.

The Neolithic was an important period in human history.

The Azuchi-Momoyama period was a very important time in Japanese history.

The Azuchi-Momoyama period, also known as the Oda-Nobunaga period, was a very important time in Japanese history.

The Mesolithic is the era between the Paleolithic and the Neolithic.

The history of the Empire of Japan is very interesting.

His long talk is just like 'a hundred days of sermonizing without a fart.'

The National Aeronautics and Space Administration announced a new space exploration plan.

The National Aeronautics and Space Administration announced a new space exploration plan.

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