Answer:
America symbolizes freedom and a new life.
Step-by-step explanation:
I haven't read the Tears of Autumn, but typically in any story, migrating to America means the start of a new life for people. If you've ever heard of the phrase, "The American Dream", it means that people come here for the opportunities and jobs. Japan does not have as much freedom as America, therefore it represents a chance to start again with new opportunities and freedom.