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lol. You know nothing about wine industry.
Your analys is based on American wine, the United States is the country where marketing is king. Some US-produced sparkling wines even use the term Champagne on their labels, a blasphemy in France!
In Europe wines are subject to very strict restrictions on yield and vine variety. In Bordeaux, The Official Classification of 1855 was requested by Emperor Napoleon III for Bordeaux wines. Brokers from the wine industry ranked the wines according to a château's reputation and trading prices, and guess what? This classification is still valid today, with almost no exception throughout history.
All factors play a decisive role in a wine's reputation: the oak barrel (yes, it makes a huge difference whether it's American or French oak), the cork, the noble rot, just everything. Why do you think the world's best sommeliers are able to identify any kind of wine by grape variety, estate, year of release...all this with eyes closed? Do you really think the reputation depends only on a label on the bottle?
Wow, this would make of sommelier the easiest of all well-paid jobs on Earth. Where do I sign? You are the naive one for that purpose.
And it's the same in Portugal, Porto is undoubtedly the best fortified wine in the world, not because Portuguese claim it, but because any wine expert will confirm it to you.
How would you react if I tell you that the best Portos are overrated and that they are equal and even inferior to any ordinary Spanish sherry?
Last but not least, your map doesn't make any sense. Portuguese have the highest wine consum in Europe. So and what? How could this mean they produce the best wines? In your map, Romanians consum more wine than Spaniards (17 liters per capita according to the map), but it's because Spaniards are staunch cerveza-drinkers, not because they make poor-quality wines.
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