The or the Warring States Period in Japanese history was a time of social upheaval, political intrigue, and nearly constant military conflict that lasted roughly from the middle of the 15th century to the beginning of the 17th century. Its name is a reference to the Warring States period in ancient China, and it is sometimes called by that name in English. The Sengoku period in Japan would eventually lead to the unification of political power under the Tokugawa shogunate.