If I recall correctly it wasn't an entire tribe, but rather a smaller group of people lead by Chief Leader Sitting Bull. One year prior to their attempted fleeing of US territory, the Battle of Little Big Horn took place in Montana against the 7th Cavalry which resulted in the deaths of George Custer and five troops. It was Lakota and Northern Cheyenne who fought. Sitting Bull feared retaliation for their victory and that's why they were trying to leave. I think they were called the Hunkpapa Lakota, a branching of the Native Lakota. I hope this helps somewhat.
There were over 77 printing presses exstablished
1: Why the vietnam war was so hard to fight. The war in Vietnam was difficult to fight due to the fact that the terrain was so harsh that it made the americans struggle to survive. There were 58,209 American deaths in the Vietnam war. 10,875 of them were not combat related.
2: Although a military loss, the Tet Offensive was a stunning propaganda victory for the communists. In fact, it is often credited with turning the war in their favor. The South Vietnamese lost morale as Viet Cong guerrillas infiltrated rural areas formerly held by the government.