You could check out this website:
https://newrepublic.com/article/126987/remaking-american-west
or this one:
http://www.ushistory.org/us/18e.asp
i'm not really sure what info you want tho..
B) The mining and cattle ranching industries increased in the West.
Railroad made transporting resources and goods to cities to be manufactured and processed which encouraged growth in the western industries.
Mining for gold, silver, iron, and tin contributed to production of manufactured goods. The ability to make money off of the mining industry attracted settlers. Ranching also increased in production with land opening up in the southwest and railroads connecting ranching areas to major meatpacking cities, like Chicago.
The answer for this question is B
What does the meaning of life mean to you?
Explanation: You have more people to govern, which means you need rules and procedures to have a strong government to be able to control a populist and a balanced one so you don't lose support of your citizens. A doom government is one with no support.