The Ship America Built in Four Days.

At 12:01 on the morning of November 8, 1942, workers at a shipyard in Richmond, California, laid the keel of a new cargo ship.

Four days, fifteen hours and twenty-nine minutes later, the ship slid into San Francisco Bay.

Her name was the SS Robert E. Peary.

The ship itself was nothing special. The Peary was a standard U.S. Liberty cargo ship—441 feet long, roughly 14 million pounds and made from some 250,000 parts. On Sunday morning, there was a keel. By Thursday afternoon, there was a ship.

To be fair, large sections had already been fabricated and carefully positioned around the shipyard. Engines, boilers and other components were waiting. Crews worked around the clock according to an extraordinarily detailed plan.

That wasn’t the trick behind the accomplishment.

That was the accomplishment.

The Peary wasn’t fast or elegant. President Franklin Roosevelt reportedly described Liberty ships as “dreadful looking.” But these plain, slow-moving ships served a vital purpose: to carry tanks, ammunition, airplanes, food and practically everything else the Allied war effort required.

German submarines were sinking Allied merchant ships at a blistering rate. America needed to build replacements faster than the enemy could send them to the bottom.

The first Liberty ships required months to complete. Shipbuilders then standardized the design, divided construction into repeatable tasks and began assembling ships from prefabricated sections. Automobile-style production had arrived at the waterfront.

By 1943, the average Liberty ship required only about 39 days to build. At peak production, American shipyards were launching three of them every day.

That’s right—three a day. By the end of the war, America had built 2,710 Liberty ships.

Call her whatever you like. A publicity stunt involving a 441-foot ship still requires a country capable of pulling it off.

And America did exactly that.

The Peary wasn’t a technological marvel. She could manage only about 11 knots. But she and ships like her were what victory required.

And when America needed thousands like her, America built thousands.

Four days, fifteen hours and twenty-nine minutes was the record.

The real achievement was the country that made such a record possible.