The earliest settlers to Louisiana were young, single men of the upper class. They came here because they could not inherit; only the oldest son could. This is called primogeniture and is still practiced in many Creole families today.
Until the coming of the "Casket Girls," there were no white women in the colony. So the settlers mixed with the local African and Indigenous women and their offspring were known as "Creole," which means "born here." So all Creoles are mixed. It's just that, for so-called white Creoles, the mixing is further back.
Many things about my family didn't make sense until I found out that we are Creole. That's why I reclaimed that name.