levo - 1:26 am on Sep 8, 2011 (gmt 0)
I had the exact same issue. I believe Google is using location/country of the websites who links to your website to determine your website's location/region.
If you're outside of US, its almost always less competitive and easy to get promoted/linked. And the more you get links from local "circles," the more Google associates you with that location.
I had to remove the section in local language, tried to decrease the local traffic/tweets/likes as much as possible, get more US/UK incoming links than local ones. Took me almost one year.