Which of the Following Was an Advantage Possessed by the United

Which of the following was an advantage possessed by the United States in the decades following the Revolution?

A) an extensive system of roads and canals that almost entirely blurred regional differences in the new nation
B) physical isolation from Europe that helped prevent American involvement in European wars during the period
C) a relatively homogenous population that quickly created a strong, united sense of American identity
D) a strong economy that dominated those of existing empires and almost immediately made the United States an imperial power
E) a predominantly older population that had a mature perspective about the gradual changes that would make the new nation prosperous