National symbols of Ireland, the Republic of Ireland and Northern Ireland with Jameson Irish Whiskey and Tullamore Dew the main whiskey brands. Poitín, made from potatoes and with an alcohol content of up to 90% ABV, is the traditional Irish moonshine, brewed illegally since 1661, when a duty was placed on whiskey and other spirits were made illegal. According to one guidebook, ""If you see a product labelled "poteen" in an airport or a bar, it's simply a white duty-paid Irish schnapps. By definition, poteen is illegal and can't be sold."" Stout, a dark beer made using roasted oats or barley, is the national beer, with Guinness heavily promoted as a
Irish whiskey cut off whiskey exports to Britain and all Commonwealth countries, then Irish whiskey's biggest market); prohibition in the United States (1920-1933), which severely curtailed exports to Irish whiskey's second biggest market; widespread counterfeiting of Irish whiskeys in America and Britain; protectionist policies introduced by the Irish Free State Government, which significantly capped whiskey exports in the hope of taxing domestic consumption; and finally, over-expansion and mismanagement at several Irish distilleries. Together, these factors greatly hampered exports and forced many distilleries into economic difficulties and out of business, and by the early 20th century, Scotland had surpassed Ireland to become the