Final answer:
The claim that all tribes of the Iroquois Confederacy remained neutral during the Revolutionary War is false; they were split in loyalty, with some tribes supporting the American revolutionaries and others the British.
Step-by-step explanation:
The statement 'All of the tribes in the Iroquois Confederacy maintained neutrality during the Revolutionary War' is false. During the American Revolutionary War, the Iroquois Confederacy, which consisted of six tribes, was divided in its loyalty. Some of the tribes, such as the Oneida and Tuscarora, sided with the American revolutionaries, while others, including the Mohawk, Seneca, Onondaga, and Cayuga, mostly supported the British. This division led to the confederacy's involvement on both sides of the war rather than a position of neutrality.