Topps is an international marketer of entertainment products, principally collectible trading cards, confections, sticker collections, and comic books. The Topps Company was founded in 1938 as Topps Chewing Gum, and in its early years produced a popular penny "Topps Gum" from a factory in Brooklyn, N.Y. After World War II, the company developed Bazooka Bubble Gum, and in 1950, added trading cards to its product line. Baseball cards appeared in 1951 and quickly became a vital part of pop culture, a tradition that continues to this day, and includes football (both American and European) and basketball, in addition to entertainment cards and stickers and albums. In July 2003, Topps acquired WizKids, LLC a designer and marketer of collectible strategy games. Topps maintains offices in Canada, the United Kingdom, Ireland, Italy, Brazil, and Argentina, in addition to the U.S.