So, basically, from a scientific point of view...?

Not exactly. We all have one common ancestor making us variations of the same, original group meaning we're all the same species and, at the end of the day, the same people if you go back far enough. We are not, however, all mixed. If you peel back the DNA far enough in white groups, according to science, you will find at base level the same dna that you will find at base in black groups. You will not find DNA ociated with white groups in blacks unless they are truly mixed.