The Vikings were active in North America in the year 1021 AD. This now represents the earliest — and only — known year in which Europeans were present in the Americas prior to the arrival of Columbus in 1492 AD. It also represents a definitive point in time by which the Atlantic Ocean had been traversed and human migration had finally encircled the globe.
Click here for original story, Europeans in the Americas 1000 years ago
Source: ScienceDaily