Historians love a crowded date. The days when empires fell, when shots were fired, when the world lurched in a new direction. But what about the days when nothing happened? Finding a truly event-free date in recorded history is nearly impossible — and that’s the point. The closer you look, the more you realize that “nothing happened” is almost always a failure of perspective, not a fact. Take April 11, 1954.

Ask any American what happened on September 11, 2001, and the answer comes instantly. Ask what happened on September 12th — or on the many September 11ths before 2001 — and the room goes quiet. Memory is not neutral. The dates we collectively remember are not simply the most important ones. They are the ones that powerful institutions — governments, media, schools — chose to commemorate, teach, and repeat. September 11, 1973: a US-backed coup overthrows Chile’s democratically elected president Salvador Allende.