The document discusses the popularity and significance of Reese's Peanut Butter Cups in American culture and history. It notes that the combination of peanut butter and chocolate in the cups, which have been produced since 1928, is irresistible to many Americans. The cups contain two iconic American ingredients and are now the number one most popular candy in the U.S. The Reese's company merged with Hershey in 1956 and Hershey continues to introduce new flavors and designs of the cups during holidays.