Answer:
The United States was transformed from an agricultural to industrial society in the years following the Civil War. Factors contributing to this remarkable change included the following: Availability of massive supplies of raw materials, such as timber, iron ore, oil and other resources.
They were searching for gold. Also at the time, people could get money for killing Native Americans.
Answer:
First is federalism. I'll put definitions of the others below if it helps cuz I can't say for sure.