Does "Asian America" exist post-1945? If yes, what holds it together - what makes it an identity/place/category? If no, why not? Does it matter?

Does “Asian America” exist post-1945? If yes, what holds it together – what makes it an identity/place/category? If no, why not? Does it matter?  

I want to say yes, but can't seem to answer the "what holds it together" part along with identity etc.