<P> Frozen coffee beverages, similar to slush, are documented in the 19th century, often called "café frappé (à la glace)". Similar is the Italian granita al caffè . </P> <P> Coffee brewed then chilled with ice, called "iced coffee", appears in menus and recipes in the late 19th century . </P> <P> Iced coffee was popularized by a marketing campaign of the Joint Coffee Trade Publicity Committee of the United States in 1920 . Much later, it was marketed by Burger King, Dunkin' Donuts, Starbucks . </P> <P> Iced coffee may be served already chilled, or poured hot over ice . Because sugar does not dissolve readily into cold liquids, it must be added either directly to the hot base, or to the finished product in the form of syrup . </P>

When did iced coffee become popular in the us