2. most of our technology comes from world war 2
4. more technology
The post-war boom for the United States was a massive historical anomaly that can probably never be repeated. Through geographic isolation and primitive long distance transportation technology, the US was the only major economy in the world left basically unscathed by the war. The lack of competition had far reaching consequences for America and the world. The whole idea of the United States as the "World Police" ( ) has its roots in this accident of history.
We had the dumb luck of that war happening at a point in history where when everyone has basically the same military technology, you could still only easily attack countries quite near you. So the US was free to churn out as much material as needed unfettered. That world is gone.
Countries with similar enough military technology to pose the kind of existential threat that existed in the 1940's can easily reach anywhere in each others territory with weapons of mass destruction. Geography cannot protect anyone anymore. If one wants a WWII level threat to the United States in order to drive innovation, know that such a war will hurt us this time. Bad.
Good luck reaping the benefits of war technology when all your major cities are radioactive wastelands.
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