Cocktail Drink

Compare the ingredients listed (spirits, sugar, water, and bitters) with the ingredients of an Old Fashioned, which originated as a term used by late 19th century bar patrons to distinguish cocktails made the “old-fashioned” way from newer, more complex cocktails.
The first publication of a bartenders' guide which included cocktail recipes was in 1862 — How to Mix Drinks; or, The Bon Vivant's Companion, by "Professor" Jerry Thomas. In addition to listings of recipes for Punches, Sours, Slings, Cobblers, Shrubs, Toddies, Flips, and a variety of other types of mixed drinks were 10 recipes for drinks referred to as "Cocktails". A key ingredient which differentiated "cocktails" from other drinks in this compendium was the use of bitters as an ingredient, although it is not used in many modern cocktail recipes.
The first "cocktail party" ever thrown was allegedly by Mrs. Julius S. Walsh Jr. of St. Louis, Missouri, in May 1917. Mrs. Walsh invited 50 guests to her home at noon on a Sunday. The party lasted an hour, until lunch was served at 1 pm. The site of this first cocktail party still stands. In 1924, the Roman Catholic Archdiocese of St. Louis bought the Walsh mansion at 4510 Lindell Boulevard, and it has served as the local archbishop's residence ever since.
During Prohibition in the United States (1920–1933), when alcoholic beverages were illegal, cocktails were still consumed illegally in establishments known as speakeasies. The quality of liquor available during Prohibition was much worse than previously. There was a shift from whiskey to gin, which does not require aging and is therefore easier to produce illicitly.