Hell, for that matter, I'm a native Murrican and you prob'ly are too.
I just ain't no aboriginal Murrican.
Now, I do know some African-Murricans. They're whiter than I am, and speak with a sorta British accent, but they was born in Africa, by golly.
A few years ago the MSU college newspaper ran an article about the situation in South Africa. The article made repeated references to "African-American South Africans". I am not making this up.