In terms of studying that attitude and mentality, it would be helpful to study the journals of someone moving Westward during that time period (mid to late 19th century).
The United States maintained neutrality up until the point where Japan bombed Pearl Harbor. After that, it was impossible for the US to keep to itself.
Answer: the effect of the domino theory.
Explanation:
A domino effect or chain reaction is the cumulative effect produced when one event sets off a chain of similar events. The term is best known as a mechanical effect and is used as an analogy to a falling row of dominoes.
The correct answer is c. withdraw their money from the markets.
This led to the complete fall of the market and high poverty, which ruined the economy.