I am uncertain if I understand your OP fully. I'll assume you are asking the question, "How relevant is one's hyphenated American identity when an American travels abroad?" That's an interesting, probing question that sparks a lot of self-reflection.
The hyphenated identity, as in African-American or Asian-American, makes the most sense only within the context of the United States. The American obsession with race and its inclination to separate mainstream Americans - i.e. British/French/Germanic people from everyone else - is what fuels this sense of not being fully American. Once a hyphenated American citizen travels abroad, though, the American political distinctions among its citizens drops. You realize that it's one's cultural attitude that makes one American. Regardless of their skin color, Americans typically think that:
- Human rights apply everywhere -- a bad assumption for Americans abroad. Sadly, human rights are not an automatic given. Many issues are not open for discussion and are often determined by a few people on behalf of the many.
- A consumerist attitude is also common with Americans, regardless of skin color.
- An over-identification with certain brands - Mc Donalds, Coca Cola, Nike - is also too common with the American mentality abroad.
The only time being a "hyphenated" American has been helpful, is when it's convenient to distance yourself from the negative perceptions of Americans. For example, I was in Bali Indonesia 3 years ago, and before leaving, many people asked, "Aren't you worried about being targeted as an American tourist". I often replied that I didn't fit the profile of the typical American whom terrorists would want to bomb. It's a well known observation that Americans of color tend not to be in control of the government .... In fact, Americans of color are viewed as being oppressed by the US government/power structure - images from Hurricane Katrina reinforced that opinion. So, when I don't want to identify with "George Bush's America", it's been helpful to be assume the identity of a hyphenated American abroad