Bourbon () is a type of barrel-aged American whiskey made primarily from corn (maize). The name derives from the French Bourbon dynasty, although the precise source of inspiration is uncertain; contenders include Bourbon County in Kentucky and Bourbon Street in New Orleans, both of which are named after the dynasty. The name bourbon may not have been used until the 1850s; the association with Bourbon County did not appear until the 1870s.
Bourbon has been distilled since the 18th century. Although bourbon may be made anywhere in the United States, it is strongly associated with the American South in general, 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 about two thirds of the $1.6 billion of U.S. exports of distilled spirits. According to the Distilled Spirits Council of the United States, in 2018 U.S. distillers derived $3.6 billion in revenue from bourbon and Tennessee whiskey (a closely related spirit produced in the state of Tennessee).
Bourbon was recognized in 1964 by the U.S. Congress as a "distinctive product of the United States". Bourbon sold in the U.S. must be produced in the country from at least 51% corn and stored in a new container of charred oak.
History
Distilling was most likely brought to present-day Kentucky in the late 18th century by Scots, Scots-Irish, and other settlers (including English, Irish, Welsh, German, and French) who began to farm the area in earnest. The origin of bourbon as a distinct form of whiskey is not well documented and there are many conflicting legends and claims.
For example, the invention of bourbon is often attributed to Elijah Craig, a Baptist minister and distiller credited with many Kentucky firsts (e.g., fulling mill, paper mill, ropewalk) who is said to have been the first to age the product in charred oak casks, a process that gives bourbon its brownish color and distinctive taste. In Bourbon County, across the county line from Craig's distillery in what was then Fayette County, an early distiller named Jacob Spears has been named as the first to label his product as Bourbon whiskey. Although still popular and often repeated, the Craig legend is apocryphal. Similarly, the Spears story is a local favorite but is rarely repeated outside the county. There likely was no single "inventor" of bourbon, which developed into its present form in the late 19th century. Essentially, any type of grain can be used to make whiskey, and the practice of aging whiskey and charring the barrels for better flavor had been known in Europe for centuries. The late date of the Bourbon County etymology has led historian Michael Veach to dispute its authenticity. He proposes the whiskey was named after Bourbon Street in New Orleans, a major port where shipments of Kentucky whiskey sold well as a cheaper alternative to French cognac.
Another proposed origin of the name is the association with the geographic area known as Old Bourbon, consisting of the original Bourbon County in Virginia organized in 1785. This region included much of today's Eastern Kentucky, including 34 of the modern counties. It included the current Bourbon County in Kentucky, which became a county when Kentucky separated from Virginia as a new state in 1792. Numerous newspaper articles reference whiskey from Bourbon County, Kentucky dating as far back as 1824. According to Charles K. Cowdery,
Although many distilleries operated in Bourbon County historically, no distilleries operated there between 1919, when Prohibition began in Kentucky, and late 2014, when a small distillery opened – a period of 95 years. Prohibition devastated the bourbon industry. With the ratification of the 18th amendment in 1919, all distilleries were forced to stop operating, although a few were granted permits to bottle existing stocks of medicinal whiskey. Later, a few were allowed to resume production when the stocks ran out. Distilleries that were granted permits to produce or bottle medicinal whiskey included Brown-Forman, Frankfort Distillery, James Thompson and Brothers, American Medical Spirits, the Schenley Distillery (modern-day Buffalo Trace Distillery), and the A. Ph. Stitzel Distillery.
A refinement often dubiously credited to James C. Crow is the sour mash process, which conditions each new fermentation with some amount of spent mash. Spent mash is also known as spent beer, distillers' spent grain, stillage, and slop or feed mash, so named because it is used as animal feed. The acid introduced when using the sour mash controls the growth of bacteria that could taint the whiskey and creates a proper pH balance for the yeast to work.