Historian Justo Sierra has written in his Political Evolution of the Mexican People that, had Mexico not defeated the French in Puebla on May 5, 1862, France would have gone to the aid of the Confederacy in the U.S. Civil War and the United States' destiny would have been different.
Istoricul Justo Sierra a scris în Political Evolution of the Mexican People, că dacă Mexicul nu i-ar fi învins pe francezi în Puebla la 5 mai 1862, Franța ar fi ajutat Sudul în Războiul Civil și destinul Statelor Unite ar fi fost cu totul altul.