The rivalry between soft drink manufacturers PepsiCo and The Coca-Cola Company—epitomized by a series of marketing campaigns in the 1980s and 1990s—is simply known as the Cola Wars. In their ongoing battle for supremacy in the soft drink market, the two companies have employed several different tactics, including commercials featuring pop stars, programs to reward loyal customers with free merchandise, and even revisions of their signature products, including what controversial changes? Discuss
Source: The Free Dictionary