The definition of the word "Yankee" is relative. To a Mexican, a Yankee is anyone north of the Rio Grande – that is, any American. In the South, a Yankee is anyone from north of the Mason-Dixon Line. North of the Mason-Dixon Line, a Yankee is someone from New England. In New England, a Yankee is someone from Vermont. In Vermont, a Yankee is someone who eats apple pie for breakfast.

Considering the anecdote above, which of the following statements about social identity is true?