What was the agreement the colonists used to trick the Delaware Indians into relinquishing more land than they intended?

Question

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The Walking Purchase was an agreement in 1737 where the amount of land the colonists acquired from the Delaware Indians was determined by the distance a man could walk in a day and a half. The colonists prepared for this by clearing a path and using their fastest walkers, thus acquiring far more land than the Delaware had anticipated.

What Was the Agreement the Colonists Used to Trick the Delaware