Describe the role of Fort Union in developing New Mexico’s trade and its involvement in the Civil War.

im going to go with b.

i believe it would influence their own way of understanding things. it shall be a foundation where they can draw or start an argument.   historians are also  scientists that  have their tools of analysis and expertise to unlock a variety of difficulties such as relationships of man, origin, politics, economy, and culture. based on facts and understanding on these areas, they may shade light to extract ideas and develop options to validate a hypothesis or debunk it.

the answer to your question is

transform it from an expensive luxury to a mid-priced good