Final answer:
The Iroquois League was originally formed to prevent war amongst tribes in the Iroquois cultural group, managing peace and resources internally while handling external matters as a unified alliance.
Step-by-step explanation:
The initial purpose of the Iroquois League, or Haudenosaunee, in the Northeast, was not to unite under one ruling emperor, nor was it solely to share resources amongst neighboring tribes or to create a unified front against potential invaders. Rather, the most accurate description of its purpose is D. to prevent war amongst tribes in the Iroquois cultural group. The confederacy, composed of the Mohawk, Oneida, Onondaga, Cayuga, and Seneca nations, was primarily formed as a military and economic alliance to maintain peace within the group, manage resources, represent the group in matters with Europeans, and coordinate the defense against external threats.