Uh, do you want a real answer?
A lot of people saying streaming is kind of correct, but this was talked about in the early days of CSGO.
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NA is huge, and it costs more money, time, and availability to get to LAN tournaments here. It's been a problem for a long time. In the early days before esports was kicking off I used to play shitty f2p fps games with skadoodle from csgo. The reason why people would play those games was because they had online regional qualifiers and companies like Ijji or Nexon would pay for you to go to korea for worlds. 1.6 and Source professional was for like, the better off young people with supportive family. So NA lost a lot of talent in those days due to people growing up and needing to work early on in life because more people here are poor than let's say Denmark, France, or Sweden. If you want proof of income inequality impacting esports, look at CoD. Look at nadeshot, he got his chance playing pro while working at fucking mcdonalds, but it was on a console. Most families couldn't afford actual gaming pcs. I remember playing css at 30ish fps on dial up and feeling frustrated going against well equipped and well off rich kids on CAL and CPL. Shit sucks.... Anyways EU doesn't and hasn't competed in really any console esports, there just isn't a gap to exploit and I feel EU as a whole is more into pc culture.
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Social programs and education systems. There are a lot of basic income welfare type programs for financial assistance, housing, and medical emergencies. Plus you don't need to pay for your higher education, and while you're growing up you are learning more efficiently, less amlunt of days and hours at school, and no "homework". Now this varies by country but as a whole EU does this a lot better than any single state in the US.
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So we covered how you have more time, less cost, and more assistance to live your dream or give you at least the chance of it if you are driven enough. But the 3rd thing is culture and opportunity. EU as a whole looks at their citizens as an investment and responsibility, even if they can't give back to society, it is societies responsibility to make sure that even the weakest and worst off among them is taken care of. In the US we care only for the profitability and hold no responsibility for taking care of our own other than a patriotic and cult like belief that any outside threat or attack against an american is one against the collective itself. In simple terms, children are grown here to be profitable and if you are not than you are to be discarded. We do this with children, adults, elderly, vets, the disabled... As bad as it sounds and as morally... Detestable as it is. It's kind of the genius of the US and simply how we play and win the game at the highest levels. It doesn't do well with pipe dreams and competitive entertainment industries. Like if we wanted to, we would create esport faculties with top of the line technology and health scientists finding the perfect freak fps players and training regimes to get all the olympic golds...like we do for other sports lol.
So to sum it up, americans work more, longer, and on average have rougher lives than a good amount of europe. In EU support is given, so talent and drive determine the best of the best. In the US opportunity is more important because you can be super talented and driven but unless you have the perfect environment to nurture those things, you'll be ground up in the system of what you need to do to be a "good" american, not what you want to do to be happy or successful. And esports like most of our entertainment sector, is to be taxed and ignored, while occasionally being a gateway for militaey recruitment or brand indoctrination.
The US will never care and support esports the same way European countries will. Just how the cookie crumbles guys, this society has bigger games to win and loose at, and it's for all the stakes in the world.