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The formation of the Iroquois League of the five Native tribes of upper New York in the late 1500s was most significant in that it:
created a successful fur trading system for the French.
prevented further British encroachment into the Ohio Valley.
provided the goods necessary for the survival of the other member tribes.
successfully blended the religious and social customs of each of the tribes into one nation.
held together as a cooperative confederacy for nearly two centuries.