context: The early years of the Muromachi period were also called the Nanboku-cho era or the era of the North Palace-South Palace when the palace's power was split into the Northern Palace and the Southern Palace. From 1467 until the end of the Muromachi era it was called the Sengoku era or "the age of the warring states". During the Sengoku era there were civil wars and power struggles between provinces. During this period Japan's first contact with Westerners was called Trade with Nanban when Portuguese traders arrived in Japan.
question: How long does the Sengoku period last?
answers.text: From 1467 until the end of the Muromachi era