the city had 10,000 residents, was relatively prosperous. It established its Carnival tradition, which continues to this day. During the Mexican Revolution, the first aerial bombardment of a naval target in the world occurred just off the coast of Guaymas. In 1913, five military ships belonging to Federal forces appeared in the bay. General Alvaro Obregon of the rebel army ordered the bombing of these ships using the aircraft named “Sonora.”
The first modern port facilities were built in 1925 for the Mexican navy. In 1942 a commercial pier and warehouse were built at La Ardilla. Guaymas’ importance as a port grew in the 1950s and in 1961, a pier for the national oil company PEMEX was constructed. A naval ship repair station, called the Varadero Nacional, and silos for the export of grain, called the Almacenes Nacional de Depósito, were constructed in 1964.
Ferry connection with the city of Santa Rosalía, Baja California was established in 1972. In the 1980s, a number of private construction projects enlarged the port further, including those built by the Compañía Mexicana de Cobre, Cementos Tolteca and Compañía Mexicana de Ácido Sulfúrico. Due to changes in Mexican maritime law, a prívate company under contract to the government, Administración Portuaria Integral de Guaymas, took control of port operations in 1995
