Because they are important to the American people and symbolize America in a whole
The answer is D) The battle of Chickamauga.
Why is the answer D)? well its D) because the Battle of Chickamauga was fought between September 18-20, 1863. It involved the second highest number of casualties in the war, behind only Gettysburg. It was a decisive victory for the Confederate troops under the command of General Braxton Bragg and resulted in the withdrawal of Union forces to Chattanooga.
Answer:
Blackfoot, Arapaho, Assiniboine, Cheyenne, Comanche, Crow, Gros Ventre, Kiowa, Lakota, Lipan, Plains Apache (or Kiowa Apache), Plains Cree, Plains Ojibwe, Sarsi, Nakoda (Stoney), and Tonkawa.