this thread is the biggest damn mess i've ever seen. REALLY???????
you are mixed race if your parents are of different racial backgrounds. it's not about the origin of humanity and where your first ancestors came from.......mixed race people constantly have to struggle to retain their identity bc white ppl wanna pretend everybody is mixed race when that CLEARLY isn't the case when racism and white supremacy is involved.
if you and your parents have white and black racial heritage then you are mixed race! if you are mixed white and black you can also identify as black - they are not mutually exclusive and you have just as much right to your black heritage and culture! I'm mixed race and I also consider myself black, using both terms in different situations. It's not a science AT ALL, it's a socially constructed classification, as many other ancient and current cultures do not define race in the way that westerners and Europeans/Americans understand it.
edit: i only mentioned black and white bc of the op's heritage - but you can be mixed with any combination of races!