There are plenty of valid claims that many other civilizations contacted America: https://en.wikipedia.org/wiki/Pre-Columbian_trans-oceanic_co... But it is meaningless since they did not write about it nor they stablished commerce. The fact is that before 1492, most civilizations in Africa/Asia/Europe did not know that America existed and that other humans lived there. After 1492, that changed forever.
> But it is meaningless since they did not write about it not they stablished commerce Depends on what you find meaningful! There was almost certainly exchange of goods between Polynesians and South Americans. The presence of early sweet potato agriculture in Polynesia and genetic admixture in both regions points to non-trivial contact. There are even parallels in terms of folk-tales [0]! (Though these are likely old…
https://news.ycombinator.com/item?id=28936345
There are also possible contacts between ancient peoples in Europe and the Americas:
https://en.wikipedia.org/wiki/Pre-Columbian_trans-oceanic_co...
But as I mention, the impact of 1492 eclipses it all (that is why is called Pre-Columbian!)