what were the physical and foreign barriers to trade in the early 19th century? identify the alternate trade route used, and explain how the Louisiana purchase improved trade in the united states. use details to support your answer. please help.

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.