Trade deals with transactions for goods and services. Trade has historically been one of the chief ways in which individuals have interacted with each other. Trade is one of the main ways that countries interact with each other, as well as individuals interact with each other.
Did the indigenous tribes of North America know anything at all about civilization outside the continent before the fifteenth century? If so, how much did they know, and what international relations ...
Which historic trade route took the longest in (time) to travel and how long did it take? Even better would be if somebody knew the commodities that were transported on the route.