Aldo - you and I have similar problems, but in opposite directions. I am an American looking to move to the UK.
Here are your best options. First, apply for the US Green Card Lottery. I have met many young individuals who have come to the US via the lottery. Can't recall the website, but go the the US.gov site and do a seach. Also - I saw ads on the Tube just last week.
Your other option - begin work for a consulting firm that is US based, but operates offices in the US. Then it is much easier for you to apply for an inter-company transfer.