Uhh... the vikings did make it here first. ~1000 AD if I remember correctly. It’s not too controversial.
It's all about perspective. How does one group of people "discover" a land that already has 20 million people living there? Whether the ancestors of those who were already living here in "the new world" in Viking times came by way of a land bridge from Asia or sailed here from across the Pacific, the fact is there were millions of people living here at least ten centuries, and probably a lot longer, before the Vikings ever thought about sailing west.