Did you get a response yet?
Answer:
Through a shared culture developed over time
By eliminating state requirements to make it easier to unity.
The immigration station on the west coast where Asian immigrants, mostly Chinese gained admission to the U.S. at San Francisco Bay. Between 1910 and 1940 50k Chinese immigrants entered through Angel Island. Questioning and conditions at Angel Island were much harsher than Ellis Island in New York.
I hope that helps.
