I think the Asian and Pacific Islander one is interesting because it lacks a shared history of strife to support the amorphous grouping. (Latino should also be treated very differently, this post is about Asian-American and Asians in America)

Asian-American, especially in New York City (but somewhat replicated across the nation), is kind of a burgeoning identity which has now somewhat of a shared distinctly American culture, but is only kind of a self-fulfilling identity because everyone pigeonholes them, domestically and wherever their heritage was from. This makes individuals forced to attempt a shared representation. But it makes less sense compared to "white", "black" and pre-colonial civilizations here, given the lower population and the large time gaps in migration waves, and the large difference in why people migrated to the US at all during those migration waves.