Why is Cinco de Mayo--a holiday commemorating a Mexican victory over the French at Puebla in 1862--so widely celebrated in California and across the United States, when it is scarcely observed in Mexico? As David E. Hayes-Bautista explains, the holiday is not Mexican at all, but rather an American one, created by Latinos in California during the mid-nineteenth century. Hayes-Bautista shows how the meaning of Cinco de Mayo has shifted over time--it...