Answer:
question 1: They increased the territory of the US
question 2: Many Americans felt it was their God given right and duty to move westward and expand democracy
question 3: The land was needed to complete a railroad
With the end of the Civil War came a great transition into a mechanized and factory-based economy, which took workers away from the farms and put them into the factories. Many people saw this is corporate great, which was in some ways true--this led to the formation of many unions and workers organizations.
I think it is B im sorry if im wrong