Huh?
Columbus kept a written record, an objective fact.
That record caused other people to act on his knowledge, an objective fact.
The Americas have now been explored by many nations and various people, of a wide variety of cultures, an objective fact that continues to be expanded to this day.
There is zero empirical evidence anyone elze made it.
The people who may have made it are under historical speculation, as in “it’s possible” but.....
Leif might have made it.
Some wayard Kon Tiki might have made it.
They never made the return trip and thus Chris gets a gold star next to his name.
As far as how the people who already lived here fared, Chris didn’t get em all.
Later people made that happen and well, lifes tough.
The Lakota had no mercy on their Canadian cousins, the Souix, and kicked them out of what would later become Canaduh.
That happened about 300 years ago and the claim by the Sioux about “Ancestral land is a bunch of bunk.
The Vikings are known to have built a settlement, it’s in Canada, an objective fact. Their explorations of this continent was preserved in their literature, again, an objective fact. The Vatican even recorded a Bishop of Vinland. It would be surprising if there were not more to be found, time will tell.
Beyond that, there is plenty of evidence that plenty of other people made it. There’s a Roman-era wreck loaded with amphorae near the coast of Brazil. Naturally, the various claims on these land are solid, but some people believe any prior visit somehow undermines their claims, so the wreck is unexcavated and the matter is closed in Brazil.