America is a noisy culture, unlike, say, Finland, which values silence. Individualism, dominant in the U.S. and Germany, promotes the direct, fast-paced style of communication associated with extraversion. Collectivistic societies, such as those in East Asia, value privacy and restraint, qualities more characteristic of introverts.
As young West Point cadets, our motto was 'duty, honor, country.' But it was in the field, from the rice paddies of Southeast Asia to the sands of the Middle East, that I learned that motto's fullest meaning. There I saw gallant young Americans of every race, creed and background fight, and sometimes die, for 'duty, honor, and their country.'