There's no "white species". There is white supremacy, which is a system/institution of power from which a conception of white and non-white racial designations are derived and within which "white" is poised as superior and non-white as inferior. But this is not something innate in anyone, it's a sociological construct with shifting boundaries over time; it has sometimes dramatic material consequences, there's no denying the violence intrinsic to it, but it is something that has to be maintained through upbringing, media, culture, and violent enforcement for it to stay standing over time. Some ethnicities that we take for granted as belonging to "white" today were not always, such as the Irish, illustrating the way that it shifts rather than having been entirely static from beginning to end.