This is not a term that has entered the language in any significant
way. Even ignoring the politics, it's a grating word formation
being formed of an acronym and then a suffix. It is also a problem
that you drop the first letter it becomes a slight anagram of "Asian".

It's pretty much unnecessary as there is seldom any confusion
as to whether "American" refers to American nationality or the
American continents, and if one needs to be more precise there's
always "United States Citizen".

Steve