Final answer:
Kiowa ledger artists used ledger books for their art after bison hides became scarce. Incidents where they might have been imprisoned include during conflicts with the U.S. Army, with the battle at Buffalo Wallow in 1874 as an example.
Step-by-step explanation:
The Kiowa ledger artists were known for their unique form of art, which utilized ledger books as their canvas due to the scarcity of bison hides, a result of mass eradication by the U. S. government. Throughout history, instances of imprisonment or detainment of Native Americans are numerous and varied. In a specific context, Kiowa artists were imprisoned during conflicts with the U.S. Army, one such incident could be related to battles such as the one at Buffalo Wallow in 1874, wherein Kiowa were trapped, leading to potential capture and imprisonment. It's important to note various movements and protests over the years, including the occupation of the town of Wounded Knee by members of the American Indian Movement (AIM) in 1973.