I think that google.com is not the same as google.us. In the US people using
google will be referred to google.us, people in the UK get google.uk. The suffix
for a given country is what will popup for the country you are in. Nobody gets
google.com. To get google.com you must apply for it. Firefox and Google Chrome have an
addon for this called Google NCR, Opera does not. I don’t know this for fact but I
believe google uses your geo-location to set the search page. Using google.com
removes your location but only for an instant; you type google.com but the google page you get is
google.us or google.no or whereever you are located)

Add the following to settings/ browser/ other search engines
Name: Google NRC
Keyword: google nrc_
Address: https://www.google.com/search?q=%&pws=0&pws=0&gl=us&gl=us&gws_rd=cr
then save

When you type (copy-paste) the above address into the opera adress bar it will send you to Google %s Google
up in the address bar you'll see www.google.com/searh (hooray)