why was the period between 1467 and 1568 called the age of the warring states
Sengoku period The Sengoku period (戦国時代, Sengoku Jidai, "Age of Warring States"; c. 1467 – c. 1568) is a period in Japanese history marked by social upheaval, political intrigue and near-constant military conflict. Japanese historians named it after the otherwise unrelated Warring States period in China.[1] It was initiated by the Ōnin War, which collapsed the Japanese feudal system under the Ashikaga shogunate, and came to an end when the system was re-established under the Tokugawa shogunate by Tokugawa Ieyasu.[2][3]
Dark Ages (historiography) The term was originally intended to denote an intermediate period between Classical Antiquity and the Modern era. In the 19th century scholars began to recognize the accomplishments of the period, which challenged the image of a time exclusively of darkness and decay.[12] Nowadays the term is not used by scholars to refer to the entire medieval period;[10] when used, it is generally restricted to the Early Middle Ages.[1]