Initially, the Carnival event was restricted to the upper classes. The lower classes watched the annual parade, but the most important events were the balls given at various mansions. This tradition continued until the Mexican Revolution. In 1913, Alvaro Obregon took control of the port, and the war devastated the area economically. Many of the businesspeople had sided with Porfirio Díaz and had to leave. The city wanted to keep the annual Carnival tradition. Various social clubs vied for control over the event, especially the naming of the Carnival Queen. The queen was determined by which group provided the most money for Carnival events, which led to widespread cheating and scandals, especially in the year 1927, when the military had to get involved to keep order.