Three-year-old Peter Araiza prepares to march with his father Francisco in a May Day demonstration May 1, 2009 in Chicago, Illinois. The march had been threatened with cancellation over concerns about the risks associated with the recent outbreak of swine flu. (Photo by Scott Olson/Getty Images)

Los nuevos ciudadanos levantaron su mano derecha para jurar lealtad a las leyes estadounidenses. Chip Somodevilla / Getty Images