The correct answer to this open question is the following.
Baseball was first introduced to Japan in 1872 when an English teacher that liked the sport taught the students how to play it. His name was Horace Wilson. The place: Tokyo. The development of the sport made that in 1920, Japan could have its first pro baseball league. After World War II, the Allies encouraged its continuation in Japan because they realized that under the prevalent circumstances, the game of baseball meant a good way to maintain the reconstruction of the country in unity and as a form of entertainment.