Conversation so far:
How was the North American fur trade in the mid-18th century?
Deerskin trade was at its most profitable in the mid-18th century.
Who was trading the deerskin in the mid-18th century?
Native Americans negotiated lucrative trade deals by forcing England, France, and Spain to compete for their supply of deerskins.

Question: How did they compete?
Self-contained rewrite: How did the European countries compete for the deerskins in the mid-18th century?