Ángel Rivero Méndez was a Puerto Rican soldier, writer, journalist and a businessman. Rivero Méndez was a Captain in the Spanish Army during the Spanish–American War and is credited with ordering the first shot against the United States in Puerto Rico in said conflict. After the war, he became a US Citizen and upon his retirement, he wrote Crónica de la guerra hispano-americana en Puerto Rico, a chronicle of the Spanish-American War in Puerto Rico. He is also credited with inventing a carbonated drink called Kola Champagne which is still sold today.

Champagne cola, Kola Champagne, or champagne soda is a sweetened carbonated beverage produced mainly in the tropics of Latin America, former British West Indies, and Pakistan. Kola Champagne was invented in Puerto Rico by Ángel Rivero Méndez. Rivero Méndez was a Captain in the Spanish Army during the Spanish–American War. In 1902, a few years after the end of the Spanish-American War, Rivero Méndez founded El Polo Norte Fábrica de Sodas where he created the Kola Champagne, which became, and still is, a popular soft drink in Puerto Rico. While elaborating the drink he worked on his book, Chronicle of the Spanish-American War in Puerto Rico.