Los Alamos
The first compute-civilization city.
Kernel
Los Alamos is the precise place where the relationship between a state, its science, and its weapons became total. Built from scratch in 1943 on a New Mexican mesa, run by Oppenheimer with Groves as military partner, populated by the central European physics diaspora plus the best American physicists Oppenheimer could recruit, it produced a working nuclear weapon in 27 months. The civilizational lesson — that concentrated state funding plus relocated talent plus a clear deadline can compress decades of research into months — is the operating recipe for every subsequent crash R&D program.
Doctrine
Compartmentalize. Hire the smartest people who can pass clearance. Run the project at deadline pressure that mirrors wartime. Treat physics, chemistry, metallurgy, engineering, and computation as a single problem rather than disciplines. Build a city where they all live next door.
Computation
Los Alamos forced the issue. Hand-cranked Marchant calculators staffed by "human computers" (mostly women — the wives of physicists), then IBM punch-card tabulators wired by John von Neumann's instruction, then the first electronic stored-program machine. The Monte Carlo method was invented here. ENIAC's first major real-world program was a Los Alamos hydrogen-bomb calculation in 1945. Modern scientific computing is, in lineage, a Los Alamos artifact.
What it gave the world
The nuclear weapon, with everything that followed (deterrence, nonproliferation, MAD). The model of the national lab — Brookhaven, Argonne, Oak Ridge, Livermore, NIST, NASA Ames, JPL all descend from this. Modern scientific computing. The deep integration of state, science, and industry that the United States rode for the rest of the 20th century.