The history of Okinawa is usually divided into five eras as follows.

Political scientists and historians have divided the development of America's two-party system into five eras.

The Eagles' history may be divided into eight distinct eras.

The history of ocean rowing is sometimes divided into two eras.

The history of road construction in Iceland can be divided into two eras: pre-1960 and post-1960.

Housing design and construction can be divided into three eras.

The church's history can be divided into three eras.

The history of the company can be divided into four eras, based on ownership:

The game is divided into four eras: ancient, medieval, industrial, and modern.

The site is divided into three eras: 1883, 1904 and 1925.