Final answer:
It is false that all tribes of the Iroquois Confederacy remained neutral during the Revolutionary War; they were divided, with some supporting the British and others supporting the American colonists.
Step-by-step explanation:
The statement that all of the tribes in the Iroquois Confederacy maintained neutrality during the Revolutionary War is False. The Iroquois Confederacy, also known as the Six Nations, was not united in its response to the Revolutionary War. The Mohawk, Seneca, Onondaga, and Cayuga sided with the British, while the Oneida and Tuscarora supported the American colonists. This division led the Iroquois to fight on both sides of the war, which subsequently contributed to the erosion of their power and land post-war due to their lack of unity.