[Fred Nerks]

Alternative theory:

The Izapa Stela Number 5 illustrates the arrival of a Caucasian people on a raft, bringing with them a living palm tree...and possibly SLAVES of African origin.

[blam]

I read one guys theory about the Olmecs and he said that at one time there was a 'land canal' across Mexico where shippers from the Pacific would off load their freight and it was 'walked' over to the gulf and reloaded onto ships for further shipping, some on across the Atantic.

He said the explains the (obvious) various races in that area.

[Candor7]

Sitchin portrayed the Olmecs as rogue miners who formerly served the Nephilim, disobeyed them and went out on their own to inhabit South America and perhaps mine there in the Machu Picchu region.

That Sitchin Time line would likely fit the RC dating.