For example, I don't need a license to write software, or sell it. I don't need any signoff from regulators. Nor is there a cottage industry of suing software developers. There are no laws specifying how the software is written.
Isn’t that generally true worldwide?
The US in general is more business friendly, which leads to people wanting to invest their dollars in US business.
I recall some German friends of mine being quite surprised at how easy it is to start a business in the US. Though some businesses the government is very hostile to, like being a landlord.
Ut happened because of cheap and plenty of VC money.
Ok, so why didn't other countries have "cheap and plenty of VC money" at the same time? Why not the UK, or Germany, or Japan?
Of all the rich countries that existed in the world at the time, why did only the US develop a Silicon Valley type of situation?
It was never about money -- plenty of other countries had rich investors. It was about willingness to take risk. US venture capital was unique in the world at that time, and it was because of their culture.
It seems part of Silicon Valley culture and technological breakthrough came from people coming from industries involved in the space program.
Space program has been the real kick-starter of VC. No other countries (except USSR) had such program.