It was mixed up the first moment Columbus opened his mouth back in Spain, so that's that.Even Orwell's NewSpeak Is Misleading; We Aren't Made to Speak Obvious Distortions Such As His "Doubleplus Ungood"
With all the people from India moving here, we really need to change Indian as referring to the indigenees. But the Illiterate Liberal Language Lords, whom Conservatives also follow blindly, are all about confusing the language instead, so it won't happen.