Question

How did westward expansion affect Native American tribes?

Answer 1

The westward expansion resulted in Native Americans move to another place that they did not like. The Westward expansion also drove Native Americans off their land. Many battles was fought and so many lives was lost. Native Americans was eventually forced to live on designated reservations.

The expansion also had a affect on the bison (Buffalo). They would kill them so they would move out of the way of the trains. 

"Once the whites started to come over buffalo numbers dropped dramatically. Huge herds of buffalo were killed for meat. While some were killed just for fun." - http://westwardlife.weebly.com/buffalos.html

So the answer (I would see from all of this) would most likely be: B

(Correct me if I'm wrong c: )