When I access YouTube's most subscribed channels, I only see the most subscribed channels by the users of my country (Brazil). I want to see the worldwide most subscribed channels, or at least US most subscribed channels. I think YouTube is (reverse) geocoding my IP or getting it from my "User Agent", because in my YouTube profile I set the country to "United States" but this setting is ignored. My browser (Chrome) is also set to accept pages only in English.
Go to the youtube homepage, and then scroll down to the bottom. Click on the location link (in your case it will say Location: Brazil) and then from the menu that appears choose Worldwide: All. Go back to the most subscribed channels page and... voila!