Great universities. English as the primary language (great learning resources available for it all across the globe). Real economic mobility - you can really

Great universities. English as the primary language (great learning resources available for it all across the globe). Real economic mobility - you can really make it big if you're smart, persevering and slightly lucky. Who you know matters to a certain extent in all countries, but the significance of that factor is less in the US as compared to the other countries, in my opinion (others may disagree, of course).