In 1859, "race" and "species" were used somewhat interchangably. Darwin's work helped to refine the ideas. This led to the modern understanding that all present humans are of the same species.
Of course, you ignore the species that went extinct, possibly as a result of poor design and poor planning from the supposed "Intelligent Designer".
I reject your premise that "race" and "species" were interchangable. Any evidence of the same?