Comparison of Japanese Dilects, Lots of History Here!
Japan has variety of dialects. Some has different accents and some has different words. There is a “formal” dialect called Hyojungo.
Beginning of the Maji period, Japanese government tried to make the country as strong centralized country. For that reason, making a “formal” dialect, which could be understand to all Japanese was necessary. In that period, there are hundreds and thousands of dialects were used in many different places. Japanese government forced people to use a “formal” dialect though education and many other ways and discriminated dialects.
Now, TV and radio spread “formal” dialects and almost everyone can understand it. Today, uniqueness of dialects is becoming popular and getting positive attention.