A main definition of a species is a group of animals that can interbreed. ...
Think about negroes before 1978! (can/could/may interbreed or marry)
This definition works only in societies based on science. Unfortunately, in our world the majority of societies are based on religion/religions. US is one of that type.
- Whenever a poet or preacher, chief or wizard spouts gibberish, the human race spends centuries deciphering the message. - Umberto Eco - To assert that the earth revolves around the sun is as erroneous as to claim that Jesus was not born of a virgin. - Cardinal Bellarmine at the trial of Galilei