One of the problems is that you will find many of the 'enterprise' jobs that you feel will trap you are commonplace in a lots of countries - certainly here in the UK and I'm sure in America also. There are more jobs in startups in the USA but not so many as you might be hoping (even if you could get a VISA). My point is the grass is not always greener on the other side.
You may actually have more success and find what you are looking for in upcoming 'developing countries' such as Mexico if you are considering all locations.
Whatever happens best of luck and I hope you find a profession you are happy with.