Final answer:
American heroes tend to be loners because America is high in individualism.
Step-by-step explanation:
American heroes tend to be loners because America is high in individualism. Individualism is characterized by valuing personal freedom and individual responsibility over community-centered values. This can be seen in the United States' prioritization of independence, competition, and personal achievement. For example, in a survey, nearly six in 10 Americans responded that individual freedom is more important than the state's active role in society.