Manhattan

Rye, sweet vermouth, and Angostura—the classic stirred cocktail elevated in the freezer.

The Manhattan appeared in New York sometime in the 1870s or 1880s, making it one of the oldest surviving cocktails in continuous use. The origin is contested, as these things usually are, but the most credible account ties it to bartenders at the Manhattan Club, where it was reportedly served at a private party in the early 1880s. What made it consequential wasn't the occasion, though. It was the idea: vermouth as a structural ingredient, not just a drop of something extra, but a full measured component that gave the drink its body and complexity. That was new.

Before the Manhattan, whiskey cocktails were whiskey, sugar, and bitters. The Manhattan introduced a fourth ingredient that changed the ratio logic entirely, and in doing so became the template for every stirred whiskey drink that came after. Rye was the original spirit; bourbon became common through the mid-20th century when rye production collapsed after Prohibition and never fully recovered. Either works, but they produce different drinks. The 2:1 whiskey-to-vermouth ratio the Manhattan established still governs the category today.