Whether it is whisky or whiskey has been the basis of many arguments over many years. The Scots spell it whisky and the Irish spell it whiskey, with an extra 'e'. This difference in the spelling comes from the translations of the word from the Scottish and Irish Gaelic forms. Whiskey with the extra 'e' is also used when referring to American whiskies. This 'e' was taken to the United States by the Irish immigrants in the 1700s and has been used ever since. Scotland, Ireland and America all have a rich heritage in the whisky industry. So what are the differences between the whiskies from these three nations?