If had the choice, why wouldn’t more Europeans choose to live in the USA?

Most Europeans have a good life in their home countries and don’t want to uproot themselves. Plus, living in the US is expensive and there are no guarantees that you’ll make it big here. It’s like playing the lottery – you could win, but it’s unlikely. The cost of living is high and the job market is competitive, so unless you have a really great skill set or an amazing opportunity waiting for you, it’s probably not worth the risk of coming over here.