Horses, guns, and licker. That's three, I'm sure there are more.
The Mexican Indians had figured out how to produce a lactose free cheese within 30 years of Spanish arrival, and that meant adopting cattle culture for a start.
Using a horse for bareback transport. Riding it until it goes lame and then eating it isn't part of any ferrier book I've read. Yes, they traded for guns, stole guns and scavanged guns but where are the mines, the forges, the machines needed to make the guns?