Final answer:
The claim that Plains Sign Talk is used exclusively by Deaf Plains Indians is false, as it was a lingua franca among various tribes, both Deaf and hearing. The Iroquois Confederacy did not maintain neutrality during the Revolutionary War, as they were divided in their allegiances. Recruiting native allies was crucial in the conquests by European powers.
Step-by-step explanation:
The statement about Plains Sign Talk being used almost exclusively by Deaf Plains Indians is false. Plains Sign Talk, also known as Plains Indian Sign Language (PISL), was historically used by many Indigenous tribes of the Great Plains region, not only by the Deaf community, but also by hearing individuals, as a lingua franca for intertribal communication. This sign language served as an important means of communication in a region with a high diversity of indigenous languages.
Regarding historical information provided in the exercises, the statement that all tribes in the Iroquois Confederacy maintained neutrality during the Revolutionary War is also false. Some members of the Iroquois Confederacy allied with the British, while others sided with the Americans, leading to a split within the Confederacy. The Proclamation of 1763 was indeed a response to Pontiac's Rebellion, a conflict arising after the French and Indian War, and it was meant to stabilize relations with Native American tribes by restricting colonial expansion westward.
The acquisition of land was a significant motivating factor in the formulation of early U.S. Indian policy, as the fledgling nation sought to expand and control more territory.
In the context of European colonization of the Americas, recruiting native allies was crucial during the Spanish conquest of the Aztecs, exemplified by the role of various indigenous groups who helped the Spaniards for their own reasons, which included conflicts with the Aztecs.