The Japanese attacked Pearl Harbor on December 7, 1941, prompting between 250,000 to 500,000 Mexicans to enlist in the U.S armed forces in hopes of advancing their social status and feeling a sense of masculinity from their military service. However, Mexicans living in cities struggled to get along with other races and faced poor quality schools and limited economic mobility. The Bracero Program was established as a result of WWII labor shortages, recruiting Mexican nationals for temporary agricultural work in the western U.S. that provided much needed income for many Mexican families.