Jōō (承応), alternatively romanized as Jō-ō or Shōō, was a Japanese era name (年号, nengō, "year name") after Keian and before Meireki.
[2] The name of this new era came from the Book of the Jin: "The Xia and the Shang dynasties follow their destinies, so the House of Zhou came when it was time."
(夏商承運、周氏応期) Within the Jōō period, Japan was implementing the Sakoku policy which adopted by Tokugawa Bakumatsu.
[5] There was barely any foreign trade from other countries, with exception to Chinese and Dutch merchant.
Foreigners were in the same situation, anyone who attempted to enter Japan's territory would be killed by the soldiers right away.