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American society seems to be much more informal than the British and, in some ways, is characterized by less social distinction. Students do not rise when a teacher enters the room. One does not always address a person by his title, such as “Major” or “General” or “Doctor”. The respectful “Sir” is not always used in the northern and western parts of the country.
However, it is best to use a person’s title when first meeting him/her, and then allow the person to tell you how he/she wishes to be called.