One effect of World War I, in which the United States took part from 1917 to 1918, was to encourage Mexican Americans to move north.
With many men at war, northern factories experienced a shortage of labor. Moving north in search of industrial work, Mexican Americans were soon living in Chicago, New York, and elsewhere in the Midwest and Northeast.
Pancho Villa (center, on horse) may be remembered best as a guerrilla rebel, but before his bloody visit to the United States, he had been governor of the province of Chihuahua in 1913.
U.S. troops who pursued him into Mexico had to withdraw because of Mexican president Carranza’s opposition to their presence.