monty wrote:
America is bigger than a country, and we have regional ethnicities, IMO.
Consider the good ole boys in the south - take a group of predominantly white, Scottish/English/Irish, protestants and cook them in the hundred degree heat for 200 years or so with side of corn bread and a big plate of ribs, and that is an ethnic group by my standards. They have common ancestry, their own dialect and religious modes, their own political culture, etc.
Other possible ethnicities: Tex-Mex, New Englander, Heartlander (Pennsylvania to Ohio/Indiana/Illinois/Iowan), Appalachian (at least 2 distinct - northern and southern).
Course, modernity tends to homogenize things (consider the Amish sk8 punks), and people move around a lot more than they used to.
These subgroups still have enough commonalities that an American, when traveling abroad, is almost always recognized as such. I suppose, if Americans had to leave the United States in sufficient numbers, they'd form ethnic communities in non-English-speaking countries as has happened in the past and present in the U.S. itself.