[DJ Taylor]

"...Semitic tribes (including, possibly, the Arabs) transplanted themselves into Peruvian culture at some point."

During my world travels, I accumulated an extensive collection of ancient stone spear points and arrowheads, and I noticed right away there was more than an accidental similarity between some of the points I picked up in the Andes Mountains of Peru and Bolivia and those from Afghanistan and Pakistan. Some of them are so identical it's near impossible to tell them apart.

However, as some of my learned friends have pointed out, there are only so many things one can do with a stone, and it's entirely possible that two different civilizations a world apart could have used duplicate stone working techniques.

[Vigilanteman]

What you said plus I don't discount the possibility of long transoceanic voyages in ancient times, Kon Tiki and all of that. They may not have known where they were going, but they were running away from something or just exploring.

I believe exploration is built in to the human DNA.