Why day of infamy is not a unique historical label

Which day of infamy is meant here?

He asks which one, because many countries and historical traditions have applied that phrase to different defeats and crises, including French descriptions of Trafalgar as well as the familiar Pearl Harbor usage.

Day of infamy is an ambiguous label rather than a unique proper name. Different national traditions have used the phrase for different events, and the answer cites Trafalgar from the French perspective as one naval example. A follow-up contrasts Pearl Harbor with other locally important labels and recalls confusion between the Glorious First of June and a different community's day of glory. A historian therefore needs a date, place, and viewpoint before knowing which event a dramatic label means. The passage is a useful watch point for understanding how apparently universal historical shorthand can conceal a national or local frame.