Which of the following is a characteristic of the american identity that developed with the frontier
a. determination
b. distrust and authority
c. simplicity
d. reliance on others

Determination is the best answer here. Those who set out to conquer the wild frontier were faced with numberless issues, many only lived because they were determined to. The next closest answer is "reliance on others", however, this answer did not apply to many who fought through the frontier because they were isolated from major cities and populations.