He made 4 voyages total and none of them landed him in North America. In fact, the Vikings discovered North America long before Columbus. There are disputed, but undeniable, Viking ruins in Minnesota, Canada and Greenland that date back several hundred years before Columbus.
To say nothing of the Native Americans or the South Americans and Central Americans that migrated to North America. Hopi Indians are thought to be part of some of the Incan tribes after they abandoned their cities.