Find out what land is for sale along the way? What would be the advantages of settling on it? (this has to do with the transcontinental railroad)

The biggest advantage would be that you would have the guarantee of readily available supplies getting to you. another one would be that if you own a shop, the more frequent visitors would be great for business.

Explanation:

i'm not quite sure how to answer the " find out what land is for sale along the way?" part but I answered the second part

a. because the u.s. was the leading with the most technology, economy, etc. also was teamed with other allies witch boosted the economy and materials to improve technology and use it.

its c