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Well, the internet is one tremendous piece of infrastructure, but that's not just it. Moore's law and the growth in computing power, the solid state of research universities around the world etc. is all contributing to the growing corpus of knowledge, fueling innovation.

Now, growth like what America saw post WW2 was definetly a one off thing: the rest of the world was in ruins, and there was great demand for manufactured goods and services from Western Europe and the rest of the world. Today, many more countries are stable and have the infrastructure to manufacture and provide goods and services. So its quite unreasonable to expect that kind of growth anymore in the US.

Where the US has excelled is in innovation and first comer advantage. e.g. Advanced computing systems, electronics manufacturing, automation, advanced weapon systems, space exploration etc. So, as the rest of the world catches up, the US economy moves on to create new markets where they have the first mover advantage. The only way to make this happen is through innovation.

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