This is a deeply misunderstood point. Many people think the Saturn V was just a German rocket design and don't appreciate how far Americans took the technology that originated in Britain and Germany post war.
"GE and Pratt & Whitney engineers synthesized British centrifugal jet engines with German axial-flow compressor research, creating jet designs that went from 2,000 pounds of thrust with tens-of-hours lifespans during the war to over 10,000 pounds of thrust with 1,000 hour service lives, enabling a generation of supersonic fighters and long-range bombers.
Other GE engineers were in the deserts of west Texas as part of Operation Fireball, where they made major improvements to the V-2 missile’s guidance and control systems, subsystem performance, and system integration. Engineers from Rocketdyne improved the V-2 engine design, ultimately building the F-1 engine which remains the most powerful single-chamber liquid rocket engine ever flown, reliable at 1.5 million lbf (pound-force) while the German engine could only generate 25 tons of thrust and routinely destroyed itself via pressure oscillation. The V-2 rocket failed more than 30% of the time it was launched during the war; American engineers brought the frequency down to under 5%.
By the mid-1960s, approximately 5% of the U.S. GDP funded new weapon systems and NASA’s Apollo Program, transforming U.S. industrial capacity. The Atlas Intercontinental Ballistic Missile was deployed in five years and required simultaneous breakthroughs in rocket engines, lightweight structures, inertial guidance, and reentry physics. The Apollo moon landing came eight years after zero human spaceflight capability.
The Archangel spy plane program went from concept to the first flight of a plane that could fly 85,000 feet in the air at speeds exceeding Mach 3 in four years. Boeing took the 747, the largest and most advanced commercial aircraft ever built, from initial concept in 1965 to planes rolling off production lines 28 months later in a project that required building a factory that remains the largest building by volume in the world today."
arenamag.com/articles/steali…
Americans are not always first movers.
Brits split the first atom, Germans made the first automobiles, and Brazilians believe they invented the airplane.
But Americans often take new technologies *seriously* far before anyone else. Which is why we sit atop the world today.