African American is neither a race nor a citizenship. If you're of African descent, born in England, you may say you're African, or English, but you'll likely never say you're English African. There's a sense of heritage in African American descent but it's also very messy. A black man from England travelling to America could plausibly be called African American because it's largely been redefined as "Black but not culturally African" in what I assumed was culturally local definition.