The technology that people can kill the opponent, to protect oneself has developed in martial arts in other countries. It has been used in military. So ordinary people in other countries don't get these technology. But they know martial arts in Japan. For example, Judo, Karate and so on. In particular, Judo is popular in Europe.
Japan origin in many martial arts. Therefore, martial arts in Japan are more popular than that in other countries.
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