Not quite.
It isn't fully known how the Native Americans came to be where they were. They may have crossed fro the Bering strait when things were a little iced over, they may have gone there before or after that.
But the word "discover" carries with it connotations of having been the act of discovery. As in, and specifically in the case of Columbus, someone who set out with the purpose of completing a map. To determine how the world was made up, and to give others a picture of what the world was. Is.
The Native Americans might have been the first there, but they didn't "discover" anything, as much as stumble across it. They were looking for a place to hunker down, with a decent food source. Columbus went to complete a map.
Whether or not you subscribe to theories of the Vikings, or the Basques, or what have you, the simple fact is that Columbus went there in hopes of proving a theory and adding to our knowledge of the world. That is discovery. Men who add to the knowledge of men.
Human knowledge and success is about the advancement of knowledge. No people who merely survived where they happened to be born has contributed anything toward that.
Human advancement and dominance is dependent on far more than a water buffalo and a rice paddy to shit in. The sooner you accept that and get off the spiritual high horse, the better off you'll be.