However, in Chrome, you can look "under the hood" of a specific page (for example, navigate to
http://www.teslamotors.com before doing this) by going to Tools > Developer tools > Resources. Then under cookies you should see an entry for
http://www.teslamotors.com, which will show all your cookies for this site (which you can right click and delete).
I notice that the "buy_flow_locale" cookie is set to the foreign page I first visted (it_CH) but I was still able to reach the US page by visiting
http://www.teslamotors.com. The other possibility is that the Tesla site figured out my area from my IP. Anyways, if I delete that cookie and refresh the page, it automatically resets it to "en_US".