Even though San Francisco is no where near Megalopolis, we considered it to be the "Megalopolis of the West Coast" for three different reasons
1. Just like Megalopolis has Ellis Island, San Francisco has Angel Island. Both landmarks were used as immigration stations for people migrating into the United States. Ellis Island opened before Angel Island, so Angel Island was also known as "Ellis Island of the West."
2. Both areas are very unique with culture, people, and places (page 138).
3. Both regions also have areas known for their business aspects. Megalopolis has Brooklyn as an impressive central business district and San Francisco has a couple districts (out of the ten mentioned earlier) that are known for their business.