What we call Native Americans crossed over from Siberia during the Ice Age and are thought to be first. But recent discoveries of "Clovis point" arrow heads may be proof that Europeans were here about the same time. As for Columbus, his discovery was the one that continued on. And yes it's still a "discovery" even if people already lived there. If we found a planet with life in it, that would still be a discovery.
well i am native American and my great aunt is really into our culture and she says that the native Americans were the people who discovered America and people who came over just spread the word about it
In a way you are asking a "loaded" question, especially politically. However even SCIENTIFICALLY it could still be a loaded question because I watched a documentary a few years back that indeed suggested Europeans "discovered" America---STONE AGE Europeans! This idea nearly blew my mind! The conventional thinking is America was peopled by way of the Bering Straight about 15,000-35,000 years ago in waves. This documentary I watched suggested that some Native Americans actually came from Europe by clinging very close to the ice sheet that covered a lot of the northern hemisphere on Earth,during the last ice age. Vikings from Europe also "discovered" America prior to Columbus and the European Spaniards. I do not know how far inland they made it, and for that matter do not know why they didn't "do" anything about their discoveries--In other words why they did not exploit the land, people, or resources like the Spaniards and other later European peopled did in the early 1500's.