In the past two years, a record number of undocumented immigrants have been deported out of the United States - most of them Mexican. <br /><br />Experts warn that the harder the US makes it for people to immigrate, the more they risk dividing families and creating a "second-class citizenry".<br /><br />Al Jazeera's Franc Contreras met some of the deported in the Mexican city of Nogales.
