I'm not sure about the hereditary bit (whether culture or risk aversion can b passed through genetics), but the culture bit has a lot of basis. Just look the the whole 'American Dream'. The US has been sold as a place where anyone can make it with some smarts, work, and perseverance. That attitude was ingrained in the country through its formation and then its expansion. Look at the silver rush in CO, gold rush in CA, oil boom in Texas, financial boom in NYC, and tech boom in SV. People have been coming to the US from all over the world to get rich since the country was formed.

One thing to remember is that the US is a relatively young country. It may be that all young countries have a disproportionately large number of risk takers and that over time that portion shrinks.

Actually there's plenty of evidence to say entrepreneurship could be partially hereditary (or more to the point a genetic disposition to be intelligent and a genetic makeup that allows you to deal with stress through low blood pressure, a chemical makeup that gives you a calm disposition, and so on)

So do you have another point or do you just specialize in attacks?

Sure:

1. Explain the economic powerhouses of Germany and Japan in the context of your 'wasn't bombed so more prosperous' theory.

2. Explain the White European Christian dominance of the US in the 'no culture' theory of the US.

3. Explain why if everyone coming to America is an entrepreneur and entrepreneurship is hereditary why there's so many poor people in the US compared to rich people. Did they breed it out of themselves or something?

4. Explain why Britain became the most prosperous and richest empire in the world even though apparently from founding to the early 1900s the U.S. was far and away ahead of the world in recognizing and rewarding entrepreneurship, which is exactly the period that Britain, not the US, rose to be the dominant economic power in the world. Hint, you've got your history wrong.

Remember you accused the original commentator that he 'couldn't be more wrong' without a single shred of evidence just generalisations of an idealized 'American Dream'. It's nationalism dude, sorry.