What economic system is characterized by the unregulated exchange of goods and services

 "The economic system that is characterized by the unregulated exchange of goods and services is "Free Market," capitalism, although there is usually some amount of regulation." 

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.