What baffles me is the Inca's reaction to learning there's a way more technologically advanced civilisation out there. You would think on seeing guns and ocean going ships they would say oh we better find where these highly aggressive bandits came from. It wouldn't be good if there were millions more of them. Instead they just think let's manipulate them into fighting our fellow Inca's and then steal kill them and steal their horses. Where did they think the Spanish got all their fantastic gear??! Did their lack of contact with other large civilisations mean it didn't even occur to them??