What is the fine-grained topic of the following text: That same year, at theÂ World Exposition inÂ Osaka, KFC and other American fast food chains like McDonaldâ€™s were met with great market testing results and helped jump start the westernized â€œfast foodâ€ movement in Japan. Only return the topic.
Westernized "fast food" movement launch in Japan at the World Exposition