Originally a presidio on the frontier of New Spain, Tucson was a Mexican community before the arrival of Anglo settlers. Unlike most cities in California and Texas, Tucson was not initially overwhelmed by Anglo immigrants, so that even until the early 1900s Mexicans made up a majority of the town's population. Indeed, it was through the efforts of Mexican businessmen and politicians that Tucson became a commercial center of the Southwest. Los Tucsonenses...