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b.t.w..not just on .com but on a number of regional googles...
I have a site in English that ranks fine in google.com choosing English version, but doesn't rank
fine country specific...
I hope that local tld will follow...
What is strange for me is some competitor sites ( in english language 9 rank better on local tld than in google.com.
I think that there are some other factors like hosting, or the "site language" of incoming links..
Something that is also ineteresting, is that your results will also change, if your not top for both, if you use a proxy server to access google results.
So if you are lower on google.co.uk and have a .com with an american IP address ( us hosting ),
using a US proxy in your browser settings, may show that you are even higher than you will ever see not using a proxy.
Also if you have a .com on US hosting you will not be in the "pages from the UK" index when the radio button is selected on google.co.uk.
In your situation I would check to see what US ISP visitors are seeing using a proxy as suggested.
If you do a search on google for proxy lists you will find lists of availble proxies you can use.
You've no specified whether you have a country specific domain or where you site is hosted, which will both affect rankings in country specific gooogle.
I ALWAYS tell my clients to get a country specific domain name, and have no problem getting country specific google rankings and google.com rankings.
Country specific rankings, arrive 6 months before the other, and whatever way you look at it, .com is harder to gain ranings in than country specific google, simple as its more competitive.
The site I am referring to has an italian TLD ( .it ) and is hosted in Italy. The site is in English and it ranks a lot better on google.com (english version) than in google.it or google.com italian version.
When I say google.com italian version or english version I refer to this code on the search bar:
Usually from Italy the default is search?hl=it.
Sometimes I have to edit it manually (to convert to en ) to check my ranking in USA......