•Why it earns a slot
Why it earns a slot: it introduces Tilbury Town and gives American poetry its first great deadpan twist ending, sixteen lines that taught a generation of writers how much you can leave unsaid.
A small-town gallery of quiet desperation, where the richest man in the poem goes home one summer night and shoots himself, and Robinson never tells you why.
This distillation is written from the freely available original, which is always the better read when you have the time: Project Gutenberg.