Which factor best explains why the United States was able to stay out of foreign conflicts?

During the 1790s, which factor best explains why the United States was able to stay out of foreign conflicts? Europe depended on farm products from the United States. The United States had announced the Monroe Doctrine. France and Great Britain agreed to end colonialism.

the answer to fill in the blank in this question would be the word resource, it is defined as the money, material or people (since human resource is a very valuable good) that a company or a person has at disposition (meaning they can use the resource as they see fit), to be able to complete a task or achieve a goal.