The more we learn about ancient civilizations, the more we realize that there were probably many more contacts between different peoples than have been generally accepted as "facts"
I think an analysis of the posts on FR which have been distributed by Sunken Civ. over the past few months will bear this out. [ref: cocaine mummies; chinese voyages; viking maps; red-haired mummies in China, etc.]
Just wait 10,000 years from now. After the earth recovers from the next ice age, the remaining civilization, who will have forgotten all history, will -re- discover America, and find a whole mix mash of different ethnic skulls. They'll never figure out Multi-culturalism.