As an American living abroad, it's somewhat annoying that the default search engine in Google Chrome in conjunction with Chrome's Omnibox is set to google.ch rather than google.com. Here's what I did to force Chrome to use google.com. You could adjust the following to suit your particular needs.
Step 1: Open Settings in Google Chrome.
Step 2: Under 'Basics', click on 'Manage Search Engines...'
Step 3: Delete all the search engines that are present.
Step 4: Set up a new entry with the following as the URL (all one line):
Step 5: Add the new entry as the default search engine. The setting should look something like this:
Piece of Cake!!!