Columbia subject headings:
National characteristics, American.
Personality and culture--United States--History.
Popular culture--United States.
Toughness (Personality trait)
Harvard subject headings:
National characteristics, American.
Personality and culture--United States--History.
Popular culture--United States
Toughness (Personality trait)
Princeton subject headings:
National characteristics, American.
Personality and culture--United States--History.
Popular culture--United States.
Toughness (Personality trait)