USA is a "salad bowl", it expects immigrants and varied cultures. Basically, coming from anywhere in the world, with some getting used to, you can blend in.
Japan is much more homogeneous culturally, and as an immigrant you will always be a stranger. Even if people will be nice and polite towards you, they likely won't be able to treat you as they would treat a Japanese, because you'd miss the cultural context which builds up from early childhood on.
Japan is much more homogeneous culturally, and as an immigrant you will always be a stranger. Even if people will be nice and polite towards you, they likely won't be able to treat you as they would treat a Japanese, because you'd miss the cultural context which builds up from early childhood on.