And then there are those who think nobody outside America knew about the New World until Columbus’ voyage even though several countries/kingdoms, including some in Europe, already had lively trade with the NW.
Totally irrelevant.
Most reasonable people still credit Watt with "inventing" the steam engine; not Hero. The wheel was invented by Mesopotamians or Egyptians, not by the Aztecs.
Democracy applied to the Indians in North America is a joke.
The mild-mannered, kind and humanitarian Vikings may have visited America, but they didn't discover it. Please note that we don't speak a Scandinavian language today anywhere in the American continent.
I celebrate Columbus Day.