It's actually not different as military tech advances drive infrastructure investment. The Autobahn, for instance, was invented to move tanks. The Romans built sturdy roads and bridges, and invented l...
All of these things you are talking about are only for the war effort. These are only for a small part. There are some valuable things in war, but the real innovation and infrastructure are obtained from civilian use. I know what you mean. But you may not understand what it means to invest in a country's infrastructure for the time being.
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