Bourbon (/bɜːrbən/) is a type of American whiskey, a barrel-aged distilled liquor made primarily from corn. The name ultimately derives from the French Bourbon dynasty, although the precise inspiration for the whiskey's name is uncertain; contenders include Bourbon County in Kentucky and Bourbon Street in New Orleans, both of which are named after the dynasty. Bourbon has been distilled since the 18th century. The name "Bourbon" was not applied until the 1850s, and the Kentucky etymology was not advanced until the 1870s. Although bourbon may be made anywhere in the United States, it is strongly associated with the American South and with Kentucky in particular. As of 2014, distillers' wholesale market revenue for bourbon sold within the U.S. was about $2.7 billion, and bourbon made up abou