The Americans have taken making whiskey to new heights with the different variations of grain. We’re serious about our whiskies, as we’ve got quite a few different federally-recognized types. Irish whiskey must be: distilled and aged in Ireland, must be less than 94.8 ABV, made from yeast-fermented cereal grains, aged for at least 3 years, in wooden casks no bigger than 700 liters (185 gallons).