Final answer:
The Iroquois Confederacy split during the American Revolutionary War, with four of the six nations allying with the British due to the influence of Mohawk leader Joseph Brandt. The decision to ally with the English was not unanimous within the Confederacy.
Step-by-step explanation:
The Iroquois Confederacy, a powerful Native American alliance in the Northeastern United States, faced internal division during the American Revolutionary War. While initially the Iroquois declared neutrality, the confederacy eventually experienced a political split regarding their involvement in the war. Influenced by Mohawk leader Joseph Brandt, four of the six nations within the Confederacy - the Mohawk, Cayuga, Seneca, and Onondaga - decided to ally with the British during this time. On the other hand, the Oneida and Tuscarora allied with the Americans. This major political division was reflective of more extensive regional and political dynamics that the Iroquois Confederacy navigated, influenced by economic interests such as fur trade and conflicts over territorial control.