I blame the Chinese for keeping all of their "ancient Chinese secrets" to themselves so that when the white man got to the Americas he had no cures for the diseases he brought.
“The best evidence is that disease preceded the settlers/conquistadors by decades killing off most of the Indian population before they met a single white man.”
Yes, I read a very interesting piece about that, in of all places Cracked.com
There was some great plague that nearly wiped out the native Americans before the white man got here. They said that had that not happened there might have been too many Indians and we could not have defeated them.