This is exactly the right question to ask! Only I would argue, that despite smaller capital availability, more regulations or even talent/language barriers sometimes, most countries in Europe would be in the second best place after US. Same with universities, demography, rule of law. On the other hand, in places like Russia, or perhaps even China recently (at least for not so well CCP conected), if you have great business idea, first thing you want to do is to run away with it to a first or second place country, before it is stollen from you or worse. US is in the league of its own, at least from a business making perspective.