September 1st, 1939 to September 2nd, 1945
The citizens of the empire in Constantinople believed that they were the citizens of Rome. Even after the city of Rome fell in the Fifth Century, contemporary Romans felt that the empire survived by moving East. In this way, Eastern and Western Rome were one in the same. It was only later that historians designated the title Byzantine Empire to the remaining remnants of the Roman Empire in the East.
Japan's Isolation policy was fully implemented by Tokugawa Lemitsu. He issued edicts that essentially closed Japan to all foreigners and prevented the Japanese from leaving.
--Hope this helps! Xx
