Japan officially surrendered on September 2nd 1945; however, they had announced their surrender on August 15th 1945, after the bombings in Hiroshima (Aug 6th) and Nagasaki (Aug 9th).
John Wolfe introduced the staple crop, tobacco.
Answer:
Christianity had spread throughout Europe and Asia
Japan has many mountains, thus, the outsiders could not easily enter Japan and Japanese could not leave the country. And, thus the self-isolation was helped by the presence of a mountain terrain. This policy was implemented by Togukawa, who insisted on preventing Japan from foreigners.
