This time i took 4 Beers and ONE HUNDRED random users, ignoring any with less than 10 or that country wasnt clear.
Beer 1 Three Floyds Dark Lord Russian Imperial Stout USA average 4.25 ROW average 4.28
Beer 2 Westvleteren 12 (XII) USA average 4.44 ROW average 4.41
Beer 3 Samuel Smiths Oatmeal Stout USA average 4.0 ROW average 3.79
Beer 4 Sierra Nevada Pale Ale (Bottle/Can) USA average 3.73 ROW average 3.53
Interestingly the Highest Regarded beers showed no real difference but the other 2 beers showed about a 0.2 difference in favour of US rating
In everycase there were more US raters: 66, 59, 79, 68 repectivly
Now again while it hints that there maybe a small difference i dont think this proves anything. But it does make me want Database access that would allow a much more in depth look