The issue is not settled for social interactions. If you want to call yourself African, Austrakian or Martian, you have any right to do it.
Nevertheless, if you're trying to get any of the goodies reserved for African Americans, such as college spots or government contracts, you're out of luck.
And if you're Democrat obfuscating with hyphens and trees, you might also be out of luck when the federal definition is read to you by a reporter.