According to Scott Watanabe, Big Hero 6 is set in an alternate future where after the 1906 earthquake, San Francisco was rebuilt by Japanese immigrants using techniques that allow movement and flexibility in a seismic event. After the city was finished being rebuilt, it was renamed San Fransokyo due to it being a city with Japanese and American architecture combined.
remember when mario galaxy first came out and people realized that the letters in the logo that had sparkles on them spelled out “U R MR GAY” and everyone thought it was an intentional subliminal message