Google chrome is always searching in local google domain instead of Google.com

The answer is actually very simple.

When doing an omnibox search my desktop was returning google.co.uk, my laptop google.com so I knew something was up - and I really wanted the knowledge graph results from .com.

Follow all these steps in order.

1. Go to http://www.google.com. If you're redirected to a country-specific site, click the "Go to Google.com" link in the bottom right of the Google home page.
2. Do any search. This sets Google.com as your {google:baseURL} in a cookie.
3. Click the wrench icon and select "Exit" to fully exit Chrome.
4. Relaunch Chrome and try an Ombnibox search now.

This method will ensure that omnibox now returns results from at google.com and still searches instantly (if you have that option selected in your Chrome settings).

http://support.google.com/chrome/bin/answer.py?hl=en&answer=106514

I created a new standard Search with the following settings:

Name: Google.com Shortcut: google.com and URL: https://www.google.com/search?q=%s&{google:RLZ}{google:acceptedSuggestion}{google:originalQueryForSuggestion}{google:assistedQueryStats}{google:searchFieldtrialParameter}sourceid=chrome&ie={inputEncoding}

and it works fine.

Going to http://google.com/ncr disables the "country redirect" for me.

Go to the Wrench icon and select Options. In the Basics sections, click Manage Search Engines in the Search section. In that section you can modify each of the query strings, so you can change it to just "google.com".