Industrialization would later influence imperialism and encourage free trade.
The westward expansion came together with the development of technologies that created modern work environment that we see today. This require a lot of people to be self-capable to survive in such working environment.
This situation really reflect the iconic American ideal of self-reliant individuals that we see in our society today.
Hernán Cortés, who was a coquistador and found the Aztec Empire and was viewed as a god because of when he arrived their god also was supposed to arrive.