http://www.gamereplays.org/community/index.php?showtopic=460305
That's every single GR tournament finals since 2008 or so. I can't speak to any of the names before around 2009, but of the finalists listed there, the following were from North America:
Gosu/Nosliw (2v2)
ntd (2v2)
That's
More recent results, from the last SNF season...
http://www.coh2.org/file/745/snf-s4-bracket-final.jpg
10 different players played in broadcasted games (semi-finals of a contender bout or higher). Of those 10, 9 were European for sure, and the last one, Twister,
http://tfn.challonge.com/elitemod1v1
Elite Mod tournament, the last real CoH1 tournament. No North Americans in the top 8. Pretty sure there aren't any in the top 16 either, but I don't know all the names there.
So yeah, there's your facts. CoH has been a European-dominated game for at least the nearly 6 years that I've been around for.