Final answer:
Native Americans' treatment of captives ranged from assimilating them into their cultures to acts of brutality, but the most significant violence was often inflicted by European settlers and the U.S. government, highlighted by events such as the Trail of Tears and the Wounded Knee Massacre.
Step-by-step explanation:
The treatment of captured enemies by Native Americans during various conflicts throughout history was often brutal, but it is important to note that much of the brutality was instigated by European settlers and American forces. The U.S. government's policy, particularly after the Indian Removal Act of 1830, led to forced relocations such as the Trail of Tears, during which thousands of Native Americans died. Conflicts such as the Dakota War, the Sand Creek Massacre, and the Wounded Knee Massacre are examples of the violent clashes between Native Americans and American forces, with the latter often perpetrating significant brutality against the tribes.