There's been intermittant contact between the old and new world for at least 4000 years. With the ocean currents and trade winds being the way they are, it's inevitable.
a.cricket
Did the Vikings Stay? Vatican Files May Offer Clues
The Kensington Runestone; verified as proof of Scandinavians in Minnesota in 1362
Apparently the Egyptians made their way here well before the Vikes.
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