In the early part of the 20th century, Kilbeggan, like many Irish whiskey distilleries at the time, entered a period of decline. This was due to the combined effects of loss and hampering of market access - due to prohibition in the United States, the trade war with the British Empire, shipping difficulties during the world wars, and Irish Government export quotas; as well as competition from blended Scotch, and disruption to production during the Irish war of Independence.