Acanceled us treasury check for the purchase of alaska is an example of which of the following?

C. Primary source document 
It was a source of information that was created at the time under study.

The transcontinental railroad provided a means of fast transportation. it cut a 6 month trip into 6 days, created jobs for many people and encouraged immigration. the homestead act played a huge role in western expansion; it allowed settlers to begin a fresh start, and gave them land in exchange for their residence for up to five years and a small fee.