There was also a Bristol shipping company in England that knew there was something out there due west just about before Columbus was born, and a Mali king had told a Portugese diplomat that some tribes in Africa were canoing out west and trading with SOMEBODY because they were coming back with weird goods. Nobody cared back then, but it wasn't totally unknown.
But that's not even the part that destroys the OP! What rips it all apart is, for the purposes of intercontinental commerce with Europe, the man who discovered our soil and opened up trade with it wasn't Christopher Columbus - it was a man, also Italian although he was comissioned under Britain at the time, named John Cabot. And the reason we don't have a statue of HIM in all the city squares across the country is literally because of his British connections: after the American Revolution and our war for independence, it was deemed by the new powers that be that we wouldn't worship Cabot as a hero because we were done associating with the British - we'd worship Columbus instead.
Did I make that clear? Christopher Columbus was the rewrite of history. Columbus Day IS the rewrite of history. Those statues ARE the historical revisionism for political purposes.