So, this is likely a dumb question, but does the United States have a Professional Go System? I know there are systems in Asian countries, but I've just never heard of any being here in the US. I know it's unlikely, but I am still curious.

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Slava Ukraini!

The simple answer to that question is: No.

No, but there are a few expatriate Asian pros who are living in the US and teach actively.
Yilun Yang (Chinese 7p), Feng Yun (Chinese 9p), Kim Myungwan (Korean 9p), and James Kerwin (Japanese 1p).

Apologies if there are any I've forgotten in this list.

Here's a good list

http://www.usgo.org/usa/pros.html

Michael Redmond is the only American pro. However, he is a pro with the Nihon Ki-in, and he lives in Japan, not America. There are other pros who are living in America, but their pro rank is certified by an Asian Go association, and they are not naturally-born Americans. They're listed at the url oren posted.

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We don't know who we are; we don't know where we are.
Each of us woke up one moment and here we were in the darkness.
We're nameless things with no memory; no knowledge of what went before,
No understanding of what is now, no knowledge of what will be.

James Kerwin is another pro who was an American before turning professional.

He still is an American.

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Help make L19 more organized. Make an index: https://lifein19x19.com/viewtopic.php?f=14&t=5207

No, but you could start one! Just pay people enough money for playing Go that they can make a living doing it.

True, I just don't want to say Jennie Shen, Yilun Yang, etc... are not American.

double-post.

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We don't know who we are; we don't know where we are.
Each of us woke up one moment and here we were in the darkness.
We're nameless things with no memory; no knowledge of what went before,
No understanding of what is now, no knowledge of what will be.

I forgot about James Kerwin, you're right. Now that I think of it, there's also Janice Kim... I don't know what I was thinking before. However, Michael Redmond is the only Westerner to ever reach 9-dan.

_________________
We don't know who we are; we don't know where we are.
Each of us woke up one moment and here we were in the darkness.
We're nameless things with no memory; no knowledge of what went before,
No understanding of what is now, no knowledge of what will be.

I don't know what you mean by "American". It's not so simple to define. Feng Yun was born in China but is an American citizen. If you have to be born in the USA to parents who are citizens then only Redmond, Kerwin and Kim would qualify. But the USA is ultimately a nation of immigrants so ...

Man, if I had $100,000,000 to spare...

(Maybe that estimate's on the high side, but then again maybe not - you have to guarantee stipends for your pros for a couple of years in advance to be comfortable having people depend on you as a source of income, and then spend money money money on popularizing Go in the U.S. to the point where revenue from sponsorship deals, teaching games, etc. balances outlay for salaries, tournament prizes, and marketing.)