<p>The South Africans are white because of the European ancestry there. You’re from Africa, but your “bloodline” is not from Africa. If you’re white from South Africa, given South African politics over the last hundred years or so, there’s probably not any “black blood” in your body, you’re almost certainly 90-100% European. Given that, YOU decide when the decision is not made for you (i.e., when the box is for African American, not black/African American).</p>